John, I'm not doubting Dwayne made the number, I just don't think it was as mild of a build as was let on.

My combo FWIW:

383 block .030+ By CRE
3.915 crank. 450 cid
12.3:1 static cr (10cc domes; .004/.005 below deck
MCH ported Eddys milled to 82 cc's-- we all know the numbers, plus I had them locally flowed. Jeff's numbers are a hair conservative.
Comp Custom solid cam= .261/.266 @ .050 .578/.585 gross lift
Eddy RPM intake
950HP worked by Biggs
1 3/4 Headers

HP? Unknown at this time. Might get it on the dyno in the spring...