TxGoat wrote:
When the engine is stopped, heat builds up rapidly under the hood,and engine temperature will usually rise for a few minutes as high heat from the exhaust manifold "soaks" back into the block and into the intake manifold. Parts like the carburetor and fuel pump will get much hotter than they normally are when the engine is running. Gasoline that is in the line and filter bowl between the fuel pump and carburetor is trapped, and as heat builds, pressure builds, which can force open the float valve in the carburetor. At the same time, the gasoline in the carburetor bowl can come to a boil, causing it to overflow into the intake. Either or both of these conditions will lead to flooding, followed by hard starting due to an empty carburetor bowl when the car is re-started after sitting a while.

TxGoat wrote:
Looks like the wrong carburetor to me. I believe the fuel inlet should point forward from the upper center of the bowl. That gets the fuel line and filter bowl, if present, farther away from the manifold.
(They're still too close, in my opinion) Also, the often missing fuel pump heat shield can help reduce hot fuel issues. Late initial timing or malfunctioning spark advance will cause the exhaust manifold to run hotter, which can contribute to hot fuel issues like vapor lock and flooding. Modern fuel blends are not well-suited to carbureted engines. The modern, EPA-approved gasoline blends are designed to be held under pressure, which prevents boiling of the fuel in the hot underhood environment. The more volatile properties of EPA gasoline aggravate flooding and vapor look issues with older cars that have atmospheric fuel systems.

Packard Don wrote:
I’m not sure how yout year of car was originally but it seems an odd place for the inlet. Is it the correct carburetor? If it is, maybe consider a right angle fitting right at the carburetor to minimize the section that is currently over the manifold. Also, my 1939 had a heat shield on the carburetor itself.