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Thanks for the advice and drawings everyone.  These will come in handy.  It's nice to have this source of information available.

I know there's been a lot of discussion about pinion angles, and I read a discussion about 6 degrees positive (above horizontal).  Another site had a photo of an unmolested 10 bolt with a positive 5 degrees with the mounts horizontal.  I realize the perches aren't horizontal in the car, so the pinion angle becomes less when installed, and increases when the car is under acceleration.  Drag cars sometimes have the pinion angle decreased...or negative from horizontal...to accommodate the "extra" rotation when launching.

I also noted the perches are set inward to the front 2 degrees per side.

Does any of this sound screwy?  Are there any other things I'm missing?

I'm a little embarrassed I didn't think to look there first!    I'd been looking only at the camaro restoration sites and they don't publish the axle tube size that their perch is made to fit, so that's how I wound up with some that didn't.

Thanks for all the suggestions.  I'd rather have new perches as I'm afraid the perches cut off another axle wouldn't fit very well by the time I got them cut off.  My skills with a torch leave a little to be desired.

I've recently started restoration of my 67 and need to replace the spring perches on the rear axle.  It's a mono-leaf car and I want to return it to it's original configuration, so ordered aftermarket mono-leaf perches.  What I received doesn't fit well at all.  They were made to fit a 3-1/2" o.d. axle tube...not the 3" found on a GM 12 bolt.  Also, the hole pattern doesn't match the GM lower shock plates that I have.  The perch hole pattern is roughly 1/4" wider (left to right) than the GM plate.  I called the vendor and they confirmed that the perches are made to fit a 3-1/2" tube, which I believe the Ford 9" and Dana axles have.  They weren't sure about the bolt pattern issue.  Their lower plates probably match their perches fine, but I wanted to use my original GM plates.

So, does anyone know where I can purchase good quality mono-leaf spring perches for my 67 that fit the 3" tube on a 12 bolt?

Sorry if this has been covered before.  I'm new here and searched but couldn't find anything.  Thanks.