Had the top end rebuilt this past March in my 305 TBI in my 87 Silverado. Didn't know you should rebuild the bottom end too, until now. Rods are a knockin', & have heard schools of thought from both ends. Here is my dilemma....... Was going to rip the 305 out & put a carb. 350 in it. Then the guy who's doing the rebuild suggested my earlier plans of putting a 350 block in it with my 305 top end on it, since it was fresh & I had already spent all that $$ on the top end. Now guys at the parts house are telling me you can't put centerbolt TBI 305 heads on a carb.'d 350 block. It'll up the compression (which is a bit of a plus), but they also said problems with dependability, head gaskets not matching, timing adjustment difficulty, detonation problems, etc etc etc. The donor motor is a 350 from a 76 Vette. If I went with a totally carb'd engine, I'd have to bypass the computer (is it hard or easy?), pull the new sending unit out of the gas tank & put a carb style fuel pump on, etc etc etc. I've already spent more than I wanted to on this motor & the TBI runs like a dog compared to my 84 with a 305 4bbl. Any suggestions? Motor will be swapped at the end of this week. PLEASE HELP!!!!!!!