Yeah, I think maybe the 750 might work better, seeing as this motor probably won't spend a lot of time at less than 5000rpms on the strip.
But then again, MM&FF got more power from a 650 demon than a 750 demon on a 393 with AFR 185's and a Comp cams xe282 and a vic jr. I don't think that there will be a night and day difference between the two carbs.
The Holley 4150hp 750 would b a good choice.
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393W: AFR 205's, hydraulic roller, TKO600.
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