I've got the older generation 4MV Qjet for 1975 and earlier cars as well as some new trucks. It's a little simpler to operate, tune, and rebuild. Parts are harder to get, nobody makes metering rods anymore. Edelbrock uses the slightly newer M4M carburetor. The 4MV doesn't work particularly well with an electric choke. The throttle response is excellent if you get your vacuum advance hooked up right. The milage is also excellent. I get 18-20 mpg. and sometimes more, from a mild 350 in my 1976 GMC 1500 pickup with a TH350 transmission and 3.07 gears. Ran a 15.37 and 90.5 mph in the quarter, which is faster than most Hondas, so it can get out of its way even with the Quadrabog. Unless you make major engine modifications, the Qjet is somewhat self-tuning. It sets the fuel air mixture based on throttle position and manifold pressure so it can adust itself for small changes n valve timing and athmospheric conditions.