So a friend of mine says,"You're going to go through all the hassle of pulling the engine out of this thing to put on new heads, intake, headers, a manual trans swap and your going to put the 307 back in when you have a roller cam vortec 350 sitting there that just needs a few parts and will give you probably 100hp more?" Ok, guess that doesn't make much sense. So I ordered the engine rebuild kit and a GM Performance roller cam today and got the block cleaned up.