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Brian,

I was referring to changing the vacuum source for your vac can from ported to full vacuum. It will make all the difference in the world. No need to mess with the dizzy. You will have more timing at idle allowing for the slow burning lean fuel to burn cooler. The ported vac is intended to make the engine run hot deliberately for emission purposes and was introduced in the 70's a an emissions gimmick!. Google it for your self!

Marion