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I'd bump the cylinder pressure up you can run a hair more cam.

Pull the heads, port them, mill them .045 and use a cheaper 8553 gasket that's about .046 compressed and you end up about 5 cc less then stock...say a #675 head is 68cc, so in effect 63.7 ish cc now n so
What is it,.0054 per cc on a small open and .0048 per cc on a big open chamber?

Do the math, search it. You want torque.