Heat Soak Solution?

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Hello everyone. I'm having a little bit of a problem regarding heat soaking. It starts up perfectly in the morning when its cold and runs flawlessly during the day and will start back up immediately after I turn it off unless it sits for more than 10 minutes. I know its not the starter because it still will crank like normal. I know exactly what is happening but I'm not sure which spacer to use. I have a 1406 Edelbrock 600 cfm carburetor with a 2701 Edelbrock Performer intake manifold.