Two things I thought about after my last post, if you have the three nipple filter/bypass,
check the vapor bypass outlet nipple, it's supposed to have a restriction, .060 if I remember.

Many of them came with no restriction, mine did (aftermarket), I had to solder it closed and drill the appropriate
hole through the solder.

Too large or no restriction will lower both pressure and volume to the carb.

On a Cal. car, I don't think the tank was vented to the atmosphere, so depending what you did with those 4 nipples,
you may have to drill a hole in your cap.

Joe