Had the same problem on my 63 dodge with tire rub and had airshocks on ran them at 90lbs to get the ride height up. I just added new rear SS springs with 1 1/2 lift higher than stock and new shocks to get rid of my air shocks.
Has newish SS springs on it now. The '64 rear end is an oddball at TWO and 3/8ths of an inch wider than a '62/'63's and the guy I bought if from didn't consider this when they bought new wheels for it. An extra inch of backspace would have been perfect. I have over an 1 1/4" of gap between tire and spring. She needs a sure grip pumpkin anyhow and may as well get rid of the taper axle setup at the same time. Tires scrub the outer wheel well on street bumps, just need the air shocks to lessen the current travel until rear axle swap. Hopefully picking up a '66 charger rear axle housing and axles tomorrow, then to find a sure grip pumkin assembly.
65 housing would be the best for your issue it's close to the 62/63 width. I did the same thing on my 64 when I had it, used the 65 housing.
'65 B-body rear ends are up pretty scarce up here in Canada, since those cars were never sold up here new. '66-'67 is likely the best bet.
That's good. Just use the '64 e-brake cables on the '66 rear end.
@moparmarks 
Thanks, the seller bought me one from Nigel..it's on it's way on Canpar with another item for the Dart that finally came in after 7 months. Should see it tomorrow. Got the car running again about 10 minutes ago by twisting the plug hard CW. Module has a loose pin by the looks of things as it's not the plug/harness.
Yep about 1/2 gone. I put a bolt and lock washer in it and it snugged up pretty tight for now. I'll have to get my cast rods out at a later date and do some filler work.
