340 on dyno video, whats your opinion

I looked at those videos of Tony's before and thought they were high but without knowing exactly whats inside those motors? Anyhow dyno no's are just that. Some "real" track no's for my '71 340 Cuda as I bought it before the mods I did>
Approx 3580lbs@line, ran alternator, mech w-pump, stock 2.02's, .484 purple, intake, 750DP, small hdrs, 3.55's, B&M super holeshot, 8x26 slicks, best was 13.29@101+, that = 301fwhp
With mods.....same stock heads, .590" purple solid, H/strip Dom int., 2" open spacer, 850DP, 1.3/4" race hdrs, 4.30's, T/A 4200 stall, 10x28's, best on that was 12.41@108 = 370fwhp, max rpm 6100........take the alternator and mech w/pump off, and I guess that would show 400+ on a dyno.