early 90s is when GM switched over - my understanding is the vortec intake bolts are at a different angle, so if that is all then teh bolt holes in the intake shold be able to be drilled...not sure though - the angles or some such might be different where the head meets the intake. the exhust is the same, the block is the same.

try calling edelbrock or maybe summit tech support and tell them you have the e-tec 170 heads and want to put the TPI intake on there and see what they asay. the e-tec is edelbrock's vortec head.

a guy at the local advance store has a tbi set up off a 350 vortec motor - heads, intake, tbi - all of it, for i think $250. 724-774-8150 but i don't have his name, sorry. i thenk he is even throwing in the computer - it is from a chevy truck and he is putting in a carb'd big block. some coworker should be able to identify him from that info. he was a skinny guy.