I have a stock-calibrated Edelbrock 1405 (600cfm) on my stock 1956 312. It runs great, seems responsive, pulls pretty hard without drama when I floor it. So, as a baseline, it’s good.

I also have at my disposal an unmodified Edelbrock 1406 (also 600cfm). This carb is supposedly the “economy” version of the 1405, which is for “performance.” It has different calibration internally including various fixed metering orifices being changed relative to the 1405. I haven’t tried it on the car.

I also have a stock 1957-specific Autolite 4100. It is considerably smaller than the edelbrocks—supposedly around 450 cfm, with vacuum secondary.

I will probably try all three of these carbs at some point, just for curiosity’s sake. The Edelbrocks have more calibration options than the Autolite to dial them in, but the Autolite was designed for the 312.

As for objectives, this is a cruiser/driver that I occasionally mash the pedal on just to feel it push me back in the seat. I do like the idea of dialing in whiscruber carb I go with for best performance/economy.

All that being said, which would you choose and why?

1954 Crestline Victoria 312 4-bbl, 3-speed overdrive