welcome to FSC...
dude you just got stiffed for your money, you should have come here 1st before listening to a shop and them telling you to go to carb... :nono:
the 350HO engine can easily be made to run with TBI pcm and stuff... Im sure 91chevZ71 will chime in and help you in a few. further more if your trans is the 4l60e then its confused as hell on what to do. i think the 60e started in 93, but who knows if it had that option in 92. then again your trans cable could be all off as well..
all you had to do to begin with was install the engine:
then get a vortec to carb/tbi intake manifold, and/or a tbi adapter plate.. simple as can be! then you would have got a mail order or local dyno tune of the pcm. computers learn to do whatever they are programed to do... its plenty bigger and badder engines running off the pcm and tbi stuff.