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I think the edelbrock performer RPM would be best cause your gonna already have enough low end power, your gonna need that extra power later in the RPM band to pull further away on whatever ur racing , just my .02 everything else sounds good man.
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He is exactly right. With the 331, your low-end torque will be incredible - believe me. However, in the upper rpm's say from 5000-6000, that 331 is really going to need air, and lots of it. not to mention fuel. I would have gone with 30# injectors on my 331, but I already had the 24's left over from my old 302 setup. I'm going to get by with the 24's until the ProCharger gets bolted up. Then, its time for some 50#ers!!!
Right now, I can tell you I am far from reaching the potential with my 331 due to the GT-40 intake and 24's - the engine falls off at higher rpms - and it shouldn't.
As for the Pro-M and recalibration...you can have their meter's calibrated to match your injectors when you purchase it. Then, later, if you need to up the injector size, you can send it back to then for a recalibration fee (not sure what it costs).
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