Hey i'm new here. Nice forum though! My 81 chevy c10 just started to die. My 305 started running real bad and at an idle it makes all sorts of clanking sounds when its warm. I'm thinking a rod bearing or something along those lines. Anyway, I want to rebuild the 305 but don't know that it can be done cost effectively. It looks like I'll have to buy new heads, intake, carb, cam, etc. to get any power out of it. I don't mind more power, thats what I want. I thought about putting 350 heads on it because I can get a pair for cheap, possibly free. Heard thats not the best idea. Other options include buying a used 350 tearing it down and adding a cam, intake, carb or looking into a big block. I know a guy that rebuilds them all the time. Most work I can do myself. Any ideas would be much appreciated.