That is the same situation as my Imperial, and I run a 50/50 pump/ Avgas blend. The FAA mandates an 18 month shelf life on the avgas. I’m not a chemist, so I don’t have any physical proof, but I believe that a month is plenty long enough for you to notice a chemical/physical change in pump gas...
I will say it is not bad fuel, more misunderstood than any thing. And with the right tune should run fine with your combo. However, I will say, it does not store well. Do you live where your car is in storage for long periods?
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Restored and test run. Does not have the choke plate, shaft or little linkage rod. I will put a new style shaft and plate in for you stock and super stock guys to pass tech. $600 plus the ride from 44515 thanks