I have tried the Ede 600, 650, 750 on my 360.
The 650 is my favorite of the three, followed by the 600, then the 750. If the 750 isn't working for you, don't be afraid to use the 600. It is a great running carb.
IIRC Edelbrock changed the Venturi or something (maybe the booster...I didn't pay a whole lot of attention when it was being discussed) on the 750 and it makes getting the fuel curve in shape a bit of a buggar.
Now that I typed that, I *THINK* they changed the booster.
