422 dyno fail

Not been through all the posts and cannot offer any new answers that have not been given already apart from giving you the specs of a '72 340/416 demon that runs here in our NSS class as a comparison>
!0.1:1, stock 2.02 J heads,73cc, may have some clean up I don't know.
hyd.cam 475"/494" [email protected] specs.
1.5/8" hdrs, air gap, 750DP, locked timing@34
now runs a TR with 2x 650's, +2/10ths and mph.
according to weight mph and it hooks well its making around 415>425hp.
shifts@5500 traps@5900>6000.