New to me 73 duster 340

Well that's apples to oranges but if it's running to its potential at all it should blaze through the tires when you mash it. Or hold you back in the seat under full throttle. I can tell you that 323s and a stock torque converter and a big cam Our recipe for mush. Or put a turbo on it and upgraded accordingly and you'll be smiling for sure. I think it needs higher ratio rear end 3000 to 4000 stall converter to start with.