Does your dizzy have vacuum advance? Could be the Edlebrock carbs are pulling to much vacuum or not enough, throwing off the timing enough to cause overheating but not enough to notice by ear or feel!

 

Are these carbs set-up for a blower. I believe a blower carb requires work to the power valve assy and some vacuum reference lines. And thats just the basics. Best to check with a pro before you melt something expensive. All those new carbs must get expensive. I'm a do-it-yourselfer and I'm cheap, but this is one thing I might pay a pro to do cause of the expense of failure.

 

Scotts right on carbs needing to be vacuum referenced. It was a nervous moment when drilled into the side of a Demon to do one for the blower once. A blower ALWAYS has high vacuum under the base plate of the carb(s), so the vacuum source for the power valve has to come from beneath the blower, on the intake, where the vacuum does vary and will work it.

I'm not sure how it would work on an Edelbrock to reference the carb, I can do a Holley now tho, after a LOT of looking around on line and finding several sights telling the proceedure.

There's a good chance your jets are too small, and it's making your engine run lean and letting it overheat.