"...+10cc estimated valve reliefs. cant find specs on the piston..."
I think those valve reliefs are closer to 5cc than 10. Not as deep as the L2262F TRW 400 flat tops, which, IIRC, were only about 6.6 or 6.7cc.
ACTUAL deck height is critical, if using a high lift cam. There are plenty of lower lift cams that will make power to 6000 rpm, in a 350.
Usually, the problem is that if you run enuff cam to make good upper rpm power, the 350 don't have much low rpm power. Therefore, converter stall speed, & rear gear will be critical, especially with the PG trans.
The entire package will need to be correct, whereas a long stroke engine, such as a 455, has enuff low rpm torque, to make up for a reasonable package that is not designed to make gobs of low end power.
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