It would be very simple to fabricate a T fitting to put into the fuel line to the carburetor with a small Holley main jet or something similar to relieve the pressure buildup in the line, plumbed back to the fuel pump inlet. About a 1/32" or slightly smaller orfice would be plenty.
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!