Re: fuel pressure?
All the top mount bowl Holley carbs are very sensitive to warpage from heavy handed maintenance over the years. If all the parts are in good condition with proper seals in place, they hold their mud pretty well. If not, they leak. I've gone through three carbs before just to find enough parts to put together one good one.
A person could just put a regulator on the fuel feed side to keep the pressure less than 4 PSI but you have to have a good gauge to check pressures that low. A manometer on the suction side would be more accurate to check a pumps draw but the output pressure is just as important.
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