340 runninng lean and overheating

V3gard said
Bad gas like in poor fuel quality?
The fuel in it now is 98 octane (supposedly) and has been sitting in the tank since, october last year possibly.

I had a guy have his car at a body shop for 2 years when came over when it was running smelled like turpentine car would ping like crazy had no power what so ever and it was a 440. the gas had went bad. if the fuel smells fresh then your good