I dont have any first hand comparisions between 454's. But I can tell you that differences in hp and tq numbers for the same displacement motors are do to different combos.
Cylinder head flow and combustion chamber designs. Piston design (flat top, dome, etc) Compression ratio and camshaft profiles all have a part in the total output of a engine.
I would guess that if your motor had the proper compression, good flowing heads and intake. And a cam that matched cylinder head flow. You could make just as much power as a LS6. JMHO
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