Your thinking is correct.
But there is no way to know for sure if any particular block will hold up for any particular number of passes, at any particular power/rpm level. That block and mains could come apart at 5 passes or 500. And if it does it could take out a lot of expensive parts around it.

IMO, if you are pushing things (and I am); you need to reduce your risk by careful inspection of parts (block sonic check, magnaflux mains, etc), setup, assembly, and routine inspections to hopefully catch any developing issues before you waste the whole thing. Or pay the big bucks up front (which is no guarantee of not blowing up for other reasons).

You make your choices, and take your chances.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1