I've delt with this issue for many years on my motors that have mechanical fuel pumps only, my solution to avoid cranking on the starter so much is to get some fresh gasoline and pour around 1 to 3 ounces down the front of each carb and hold the gas pedal down about 1/4 to 1/3 the way open from the idle position and keep the rpm under 2000 RPM as soon as you can control them after it starts and runs: up wrench up: scope:
Let us know your results, hopefully it will help others on here: luck:

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)