best carb for 340?

I have a 650 AFB on top of a 383 in my 69 A-100 works dam good for toot'n around town. Nice and crisp throttle response. Although I much prefer the Pro-form 650 for tune ability.. I find that the oil is a lot cleaner for a longer periods of time with the AFB. Helps extend the ring life of ole girl. :)