Vapor lock

Take a look at your choke when it happens, I have 360 with 6 pack that I recently put on my 65 barracuda and my heat crossover is blocked as well. Sometimes when it’s hot and you pump it the choke will still slam shut and cause hard starting. I was told with those crossovers blocked the choke will not function correctly. I plan on fixing it just been to lazy to deal with it.