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I don't think you want to run much past 9-10 psi with stock internals and running pump gas. Tough to say which pulley because you have a few mods there that will lower your boost as compared to a stock Whipple build. Call Whipple. Or call one of the vendors here who have done a lot of builds. They'll tell you which pulley will be best. Of the ones you have...I bet the 3.75 pulley is the one.
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