There's a guy on FB w/ a Goodwin Competition built 440-1 headed 555" nitrous motor that made 1100 hp NATURALLY ASPIRATED. I know Goodwin is good and all, but they're making around 200 hp over what anyone else can w/ a 440-1 head. Maybe they use Koffell's dyno. 
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
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