68 383 with 750 carb. Runs rich

gdbuick said

Thanks for the advice. Unless my power valve is shot I’m very confused what is happening after the car runs just a short time and sits for a about an hour it’s hard to start. Stone cold it fires right up.

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If you let it sit for an hour after running for a while then before you try and start the engine pour some gas down the carb. If it fires up like normal you'll know that the gas is evaporating out of the carb. You might not know why the gas is evaporating but you'll know where you're problem lies.

treblig