Forget the fuel pressure regulator. A needle valve controlling the volume of a bypass line back to the fuel pump inlet can control the volume and pressure supplied to the carburetor. Install a temporary pressure gauge just ahead of the carburetor and adjust the flow until you get the desired pressure. This also prevents fuel pressure buildup and flooding in a "hot soak" situation in the summer.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!