7000 rpm in a 350 is almost 4100 ft/minute mean piston speed. I'd be looking at forged pistons, steel crank, and balancing if I was planning on really going up there very often. A two-bolt block would probably be adequate for dragstrip duty, but I'd want four for any sustained high-rpm use (such as open-tracking, open road competition a la the Silver State Classic event, and possibly Maxton Mile).
Norm
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