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Is this the engine with a low rise 2x4 ece set up?

If so, I bet there would be 3 tenths improvement in a single 4 set up.

I'd guess that would make in the 525-550 range with what you mentioned and single 4. Might be making 500 if lucky with a low rise 2x4.

If you like the look of the 2 4's, got to live with the handicap it will have.