57 is probably not enough FP. Those things tend to want at least 60, and usually more like 65, before they'll work reliably.
LEAVE THE TIMING ALONE!!!! It didn't just up and jump off into the ozone somehow all of its own accord for no reason. Just DIDN'T happen. Don't worry about it. Don't let that big nut that's supposed to stay between the driver's seat and the steering wheel, back off and fall under the hood and start banging around and monkeying with things. If you mess with it, then that's just ONE MORE thing you'll have to go back and fix once you identify the REAL problem, which that is NOT it.
A no-start is the easiest thing in all the world to troubleshoot. I'll take working on a no-start over a runs-like-crap any day of the week. There are 3 magic ingredients required for an engine to run: compression, spark at a reaonable time, and air/fuel in reasonable proportion and quantity. All you gotta do, is figure out which one disappeared, and put it back. Eh??
So, approach it logically, and realize that there's ONE thing somewhere that isn't right, and LEAVE EVERYTHING ELSE ALONE until you've found it. I'm reminded of a story my late little bro used to tell, from when he was the service write and asst mgr at a dealership. Car (Roadmonster w/LT1) comes in on a hook one day; was driving down the road, running fine, and just conked out. He assigns it to his "problem" tech because that's all he had left. Tech comes back and says it needs plugs, wires, Optispark, fuel system cleanout, fuel filter, and some other stuff. Little bro asks him "why did it stop running". Tech says he doesn't know but after he changes all that stuff it'll probably work and then he'll be able to rule all that out. Little bro asks him "one more time, why did it stop running". Tech tells him to go sell the customer what he says it needs and let him make some money from doing all that work. Little bro fired him ON THE SPOT.
Don't be that tech. In the case of the car above, ONE THING somewhere, up and broke. This lazy tech was going to empty the poor owner's wallet on futility, and either hope that it accidentally started wrking again, or that he could continue to screw the owner out of even more money on even more "maybe it's this, maybe it's that" uselessness. Don't be that tech.
Realize that some ONE THING failed, and all you have to do is find it. Think carefully what the ONE THING could be; it HAS TO BE something common to all 8 cyls, something that can easily fail (no space-alien visitations required, or multiple cascading chains of wildly improbable events, or stuff like that: ONE SIMPLE THING somewhere). Remember, when troubleshooting, keep it simple. "The simplest explanation that fits all the facts is usually the right one". Think carefully about that quote, one word at a time: simple, fits, all facts, usually, right. For example, the space aliens did not take a break from creating crop circles in Indonesia (their latest joke the last month or so) and come jack with your timing. That doesn't pas the "simple" test.
Now: we can be reasonably sure the compression didn't just go away while the truck was sitting. I think we can safely rule that out.
Likewise, if you've got nice big fat purplish-white sparks that look like they'll jump a ¼" gap, then that's good too. Not little wimpy yellowish-blue ones that look like your lawn mower's sparks, I mean BIG FAT ones. Check that, make sure. If the spark is weak it might need a dist cap or rotor or something. ONE THING. Not, every piece of the ignition system; not, move the timing, which if the bolt is tight, didn't move. Simple. Keep it simple.
Just because a plug is "wet", doesn't necessarily mean you have ENOUGH fuel. Your highest probabilty thing to have up and failed, involves fuel. All you have to do to identify that or rule it out, is pour some fuel into the intake. Gasoline or starting fluid will work for this test. I would put the truck back together; put the plugs back in and all that; and do this test FIRST. Just pour in an ounce or 2 and turn the key. Either it will start right up, or it won't. I'm betting it will fire RIGHT UP, and will then die. This indicates a fuel problem.
Go try that and see what happens.