My buddy did a 6.1 and the overdrive in a 65 Coronet. He got it as a take out for far less than 14k. He did a RMS K-frame with TTI exhaust. He has put 25k miles on the car since he finished it He told me he gets 20+ mpg on the highway and he has had zero issues with it. If more power is what you need I would think a bolt on supercharger and a tune would hook you right up. I've seen him jump on this thing and it's no slouch as it is(all stock)!
He told me he gets 20+ mpg on the highway and he has had zero issues with it. If more power is what you need I would think a bolt on supercharger and a tune would hook you right up. I've seen him jump on this thing and it's no slouch as it is(all stock)! 
