Yes, the Mustang adjustable regulators do work. Holley makes a good regulator (red in color, good rust protection). BBK's are overpriced as always, and I've had more than one leak. Aeromotive is $$$, Accel's are...functional at best. lol
I'd advise you to consider a small screw-in fuel pressure gauge on the fuel rail if you don't have an on-hood or in-dash gauge, so you can dial it in quick and easy. They're fairly cheap, and can be an indispensable diagnostic aid. IIRC, mine is an old BBK from one of my Mustangs.
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