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I have the same set up on my 69 GTX. 440, performer rpm intake, 750 eddy carb. Had to go with a drop base air cleaner from eddy. I think it was a 1 1/2" drop base. If you get to much drop it may interfere with the throttle linkage and electric choke.
Jack it up and as someone rotates one of the rear wheels one revolution, count the number of rotations the drive shaft makes. If the drive shaft turns about 2 3/4 turns you have a 2.76 gear, about 3 1/4 turns you a 3.23 gear, about 3 1/2 turns a 3.55 gear, and if it turns about 4 turns you have...