I have the smaller 475 model on my 66 (see sig). I think mine does a little less CFM than the one you got, and mine works fine.
Even with the poor air flow of my "pre-space age" Mustang.
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347, 279/284 .493/.510, TFS TW, Stealth, 750, Flowtech hdrs, Dr. Gas X, 2 Chmbr Flowmaster, MSD 6AL-Dist.& SS coil, Art Carr C-4, Currie 9" w/3.55, alum Drv Shft, susp mods, 4 wheel power disc
In a 66 coupe
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