crankshafts ???
Forged is always the way to go for N2O/boost.
RPM limit depends on a lot of things. If we rule out the valvetrain, transmission, a budget, and everything else, you could build a bottom end to survive spinning to the moon.
4-7 swaps do not work well with the LT1, it has to do with the intake and making certain cylinders run lean. Sorry I don't remember the specifics as to which cylinders got worse, but overall disadvantages outweigh the advantages when using an LT1 intake.
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