The only way you will get away with not pulling the heads is running beehive springs or running a cam under .480" of lift. I have the same cam but with 110º lobe separation, and it makes a ton of torque down low in my 383. It's a great daily driver cam, the only issue you may have on tuning is with the tighter LSA, which may not be an issue since Vortecs are MAF. My heads were cut down for stock style SBC springs (Vortec springs don't have a damper) + more lift, and cut/tapped for screw-in studs. Screw in studs only makes sense to me when you go with a performance cam, especially a roller... otherwise you may risk pulling a pressed-in stud. I'm also running stock rocker arms, but may upgrade to some aftermarket arms since the stockers are only stamped.