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I took the Eddy 750 off my mild 440 about six months ago after many weeks of tuning with an A/F sensor and gauge. I moved up to the Eddy 800 1413 and it was a night-and-day difference. No low-end stumble and the A/F mixture was perfect right out of the box.

There is something about the accelerator pump and the 750 that doesn't work well with many big blocks. I was able to tune most of the stumble out but I never could get it to smooth out completely. I sold the 750 on Ebay and bought the 1413 and the car runs like a top now.

the 1407 i have has a 35 squirter which is too big for driving and the 113 primary jets are ridiculously big. i also have concern about the .046 idle air bleed in combination with a .037 idle jet. they're fixable but need some patience and a little working knowledge of carbs.