[olddog]

If you want to stay stock stroke, look for a large truck 391 FT engine. They are the same stroke as a 427. Not sure if all were steel, but many of them were. The snout is larger diameter and must be turned down.

A local engine builder had one a few years ago, when I talked to him. I don't know if he still does.

If I was going for high rpm, I would start with that crank. Grind it smooth, to get rid of any crack initiation points. Shot peen, nitride harden, generous radius, balance, etc.