1956 mercury 312 stalling

[Abchoppers]

Hi all, I’ve been bugging the guys at Jalopy Journal for a couple weeks so I’m here to spread the love. 1956 mercury custom 312, got it about a month ago. Bought it from a great guy who only drove it about 2,000 miles in 20 years, so it sat a lot. Initially had a lot of hesitation on take off. Upon recommendations I inspected the fuel tank and it was not rusty, fuel line was clear. I changed the fuel pump, the inline filter after the fuel pump, and ultimately the carb. It has a new Holley 4bbl. That cleared up the hesitation, but a new problem arose.

Randomly the car will act like it’s running out of gas and leaves me stranded. After many attempts to restart, usually involving pouring gas directly into the carb, it will start and then run fine. I have a hard line from tank all the way up to pump, with the exception of a 6” rubber hose going from steel line to fuel pump. After pump is a hard line to an inline filter that has two short rubber hoses to connect, after filter is hard line directly into carb.

Here are some things I’ve noticed when this happens.
1. When removing inline filter the fuel pump definitely pumps gas out of the line while cranking.
2. When removing line from carb, gas does not always pump out. Sometimes a little, sometimes none. Gas filter is brand new and was changed to another new one with no luck while stranded.
3. When stranded the primaries do not shoot gas into the first 2 barrels of the Holley. So must be the filter, but it’s new and I’ve tried more than one
4. Car will only start after 15 minutes of messing with it by pouring gas into carb directly, starts up and dies. Do this multiple times till it reluctantly starts and lots of vigorous foot pumping gets it to clear up, then runs fine

I’m stumped and can use your knowledge
Thanks in advance
Ryan