Am I running out of air?

Jeff Parr /
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Treats 70cc cylinder kit

Treats stuffed crank

Case matched

15mm bing clone 2.15 atomizer with #1 grandpa intake don’t remember the jet.

Treats hi compression head

PROMA circuit pipe

My problem is with four stroking at top end, I’ve gone up and down with jetting then went to the 2.15 atomizer that did help but I’ve still got the problem. So I’m wondering if I need a bigger carb-intake but here’s the issue is it will be going on a pinto and the frame might be in the way of the carb. So what do you think, More carb or ?. thanks for any and all help.

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