I have owned in later life a 71 Demon 340 and a 72 Duster 340. I sold the Duster a few years ago and that is one of the cars I regret selling. It was a high mile car but had been well sorted. Auto A/c and the deluxe interior with a bench seat with a fold down armrest. A well set up Thermoquad ( a rare thing) that was a blast to floor it at like 20 miles per hour! I think the carbs on those 340's were 800 cfm? Thanks Tim for the info!