Help with carb flooding.

What brand carb?

Eddie obviously. :D
Maybe not, but where have we heard this before? :-)

Cleaning the crossover out made it worse probably, as the crossover needs to be blocked off to keep the temps down at the carb.
If you don't have it, a nice big phenolic or wood spacer helps a lot.

The problem with the clothes pins idea is that the fuel is boiling after it's in the carb bowls and the clothes pins used to be used for vapor lock in the fuel lines.

Building a fuel circulation/return system can help a bit, but it does not address fuel temps after the fuel is in the carb already.
It just makes it where the fuel that goes into the carb is cooler that it would normally be from sitting in the fuel lines under the hood before it goes into the carb,