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This probably won't help you, but I dyno'd a fairly stock 440 on a chassis dyno years ago.

440, .030" over, KB pistons, Mopar .474 lift cam, stock 906 heads with upgraded valves and springs. Performer RPM intake, 850 carb, and 1 & 7/8" headers.

Made 305 rwhp and nearly 600ft lbs or torque on the dynojet dyno.

Eventually, I went with a bigger cam, and edelbrock heads and made 360rwhp.

-dan



I think you are right , that won't help , what was stock about it , SOME of the castings ??