My 1981 chevy c-10 is just sittin in the yard. The 305 started running real rough last year. Some say that the cam is soft and acting up. I found a newer gm crate 350 sitting in a short bus in a field. They want $700 for the whole bus. Engine and trans. have 1500 miles on them. Been sitting for a couple of years. If I get it i would like to build it a little but need it to be reliable and able to withstand hauling loads in the back of my truck. Any thoughts would be nice. Should I replace all seals and gaskets? In a few weeks I hope to have more info on the engine.