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What ratio would be best when adding av gas?

Why the mix with marvel mystery oil?

I have easy access to aviation fuel and wAs wondering if there is any benefit/downside to using it. Stock 383 4bbl. My thought was to mix it with 93 octane. Maybe help offset the ethanol content.

Engine runs cool with no shroud. Cranking with no pedal input doesn't work. Haven't tried putting it all the way to the floor yet. Ambient temp has no affect. It happens weather it's 70° or 50°.

It actually runs cool. I'm assuming vapor lock because a hot restart is difficult. I'll have to crank on her 6 or 7 times and pump the accelerator. It's a 383 with a 4bbl eldebrock. Just wondering if heat tape on the fuel line will help.

Think I have the dreaded vapor lock problem. Hard to restart when hot. The most effective remedy that I've seen is to install a fuel filter with a vapor return line. Question I have is did a 69 charger come factory with a return line to the tank? If not what would be the best way to install one?