I changed the rear out on my '63 and if I remember correctly, the perches had to be welded on horizontal with the pinion flange at 12 deg from vertical.
Take your rear out, make a jig out of some heavy steel that allows you to bolt everything down and hold every flange in place. Then either cut off the old original flanges and weld them on the new rear, or use some new aftermarket ones. If you'll send me an e-mail using my profile, I can give you a more detailed explanation. It's not hard to do this.
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David
[This message has been edited by just a six (edited 03-10-2003).]
