I currently have a mild 350 in my camaro right now. Previous owner told me that it was bored .60 over. I am about to spray it with nitrous just to have some fun with it, I dont expect it to last very long. Obviously i wont be able to bore it out anymore if I cause some real damage. Anyway, I have been wanting to learn how to build a motor or at least tear one down. I had thought about purchasing a shortblock or good longblock vortec 350 (96-99)....the reason I was thinking one from these years is that I know it will be a roller block, I might be able to get one with the serpentine system still hooked up...and it will have the vortec heads on it. Preferably I would just take the heads off, and get the fitted with some better springs (and whatever you have to do to allow them more lift), replace the gaskets and add a decent cam in it. I have no idea if these blocks are good starting points nor do i know if they are 2 bolt or 4 bolt mains. Any tips?