64,
You may need a insulator plate under the new carb that the old one did not have. Edelbrock carbs tend to have a hot start problem without it. The last one I installed had a disclaimer in the box about flooding and fuel pump pressure.
Fred

1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine