Okay guys, i've been shopping around looking for an engine and i have a few more questions. Is some rust okay on the engine block and or intake manifold? as long as it isn't deep? and is that fixable? Also, if i find one with a automatic tranny will it fit no matter what or does it matter? Oh, and will a 350 with stock headers fit my current stock exhaust? and how old of motor should i get? is like a 68' or 69' to old? would i be able to use unleaded gas with an engine that old?