Air blowing from oil fill location

What gearing are you using? 17-34? 18-32? Wrong ratio could bog it down. My engine's compression is a bit down (120-125 psi warm throttle open) and her performance is down. She still gets to hiway speeds for a while and she don't like long or steep hills. 17-32 sprockets and Mike's 5th gear OD. I'm no lightweight either. Check her ignition timing and the advancer's condition. Could be worn and need lube.
 
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