I'm kinda partial to my combination. S400-75 is cheap. 80 or 88 might be better suited for all out power, but this working well.

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'72 Scamp, 3500#, 440, S400, blowthrough, meth. inj. 9.78 @ 139 so far at 12 psi, 11.00 @ 131 on real street tires.