Thread: 350 will not rev when hot

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I pulled the fuel lines as far away from the block as I could thinking that. Could it be vapor locking inside the carb? It did the same with an edelbrock carb i thought it was something wrong with that carb. Not much chance in two carbs being bad. I did notice today the fuel pump was hot but I revert back to if it was fuel issue it would've livened up when I poured fuel down the carb. Also note the engine runs around 150degrees since its fresh water cooled.

The way it backfiring could there be something with the timing or my adjustments on the rockers are off? No matter where I put the timing it has the issue.