[Formulajones]

Originally Posted by 64speed

I am in the Carolina mountains. Way above sea level. My transition slots are not uncovered, in fact the idle screw is barely turned in. My idle is a loping idle between 900-1100. I am using the Summit RTR distributor that I stepped down to the 18 degree bushing in to cure the overheating. Now it stays dead between 176-183. Initial is 14 degrees. 15 pounds of vacuum.

That's plenty of vacuum. Step up the power valve. 6.5 is way too low for that engine. Start with an 8.5 and work from there.

I'd bump up the front jets too. 2 sizes to start, but as mentioned, it might take 3 or 4 sizes.

This will most likely take care of your WOT stumble.