I have a 1988 3.5 from a 535 which I plan to use in a race e30. I am thinking of turboharging it, but I have no idea of this engine's specifics like; -compression ratio -strength of crank, rods and pistons -what can be done while the engine is apart to strenghten it -any weaknesses with this engine? I would like to thank anyone who can help me in advance. Mike