i am in the process of building a engine for my 1994 k1500 and have a few questions. the block i got is out of a 1989 originally ( 1 piece rear main) and has had a roller cam swapped in. I dont know what the cam is or if it will work with my TBI and smog. I am thinking its a cam out of a newer L31. the only #s i can find are 155 cpc bc 17.