FWIW...my cuda only made around 630 RWHP on the local dynojet. I was surprised (figured it'd be higher, of course), but didn't really care since the car had already run 9.50s at 140+ mph at 3800 lbs.

Use the dyno as a tuning tool and nothing more.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax