[Lynn]

First:

What Eric said: "Next, check/replace the fuel filters in the float bowls." No one on here knows Holley carbs better than Eric.

Then, what Eric said next:

"If the car sits for extended periods, you might check to see if the sock in the fuel tank is getting clogged or varnished up."

It is a classic case of fuel starvation. Replace fuel filters first. If problem persists, remove the fuel filler cap, then remove the fuel line before fuel pump and blow a small amount of compressed air (too much and you could blow fuel up and out of the filler neck) which will dislodge any thing clogging the sock. Re-assemble and take it for a spin. If it is "fixed" then you need to remove the tank and the tank unit and either clean or replace the sock. Blowing back through it is only a temporary "fix".