if it is stock, and has centerbolt valve covers, it's PROBABLY a roller cam engine. i say probably because i have an 87 1/2 ton 4X4 350 that had centerbolt heads on it and a one piece rear seal but not set up for a roller cam. i thought it was weird. if you can, pull a valve cover off and shine a flashlight down a pushrod hole and look for a retainer around the lifter. if it has that, it's got a roller cam. i think all 87 and later car small blocks are rollers, and a very select few late 86 engines, as well.
you don't plan sincerity.
you have to make it up on the spot.
wanna hear about 20 years ago when i was too smart to know any better?