Garrett Ellison said

Yeah, the race gas concentrate is loaded with MTBE. Some users have plug fouling from MTBE accumulating on the spark plugs. The AV/Gas is really the best option as far as cost unless you can buy 100 octane leaded race gas by the drum at bulk cost and run it 50/50 with pump premium. I get mine about two to three gallons at a time in a can and take it to the service station to add before fueling up.

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MOPARMAGA said

Yes, I still have those too, I'm going to for my next build offset gring a 383 crank to 3.550 stroke & find some pistons I think a 1.60 compression height I can't remember off the top of my head, I did the math the other day, in a year or so I'll see about just making a street engine with a 4 speed & my 440 source heads for just a put around in my 99 dakota r/t.

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