I would bet that the fuel pump is giving out. I'll have to post more info on the type of electric pump that I use, and what I use to control it. That will come after I get home from work today.
The electric fuel pump I use on both my 63's is a Carter P60430 The electric fuel pump is controlled by a Fuel Pump Safety Switch, made by Revolution Electronics. Part # 12003 revolutionelectronics.com
The controller senses a signal from the coil. If the car stalls, the fuel pump shuts off. At start up, a micro processor gives the fuel pump a 2 second run to prime the carb.
I love it, you can turn the ignition switch on to troubleshoot something, without the fuel pump running.
The pump is designed for systems without a return line.
I used the stock setup for the fuel lines.
I have the stock pump gutted on the sedan, and have the pump removed on the hearse. I used a barbed fitting for the end of the fuel line, and made a bracket to support the end of the fuel line.
A big block chevy fuel pump block off plate is a perfect fit for where the fuel pump was.
The pump is not noisy at all, and I installed the pump right in front of the gas tank. Plenty of room.
So a "big block chevy fuel pump block off plate" would be perfect fit?
This is one that could work: Summit Racing® Fuel Pump Block-Off Plates SUM-402035 or you have a better suggestion?