Setting pinion angle on a leaf spring car

[Lemans1]

Hello. I bought a 58 Olds that had been setup with a Ford 9". However
the pinion angle is pretty far off. I need to bring it down by atleast 7*.
I have always had A bodies and just adjusted the UCAs. I see the shim kits available for the spring perches, but they just strike me as something that would be safe for big adjustments. Has anyone used these for more than a couple degrees? Any other alternatives to cutting and rewarding the perches?

[dontlifttoshift]

Does it have lowering blocks in it? I have machined those on a wedge before to get the angle I wanted.

Nothing wrong with the angled shims but I do not like stacking them as you lose the engagement of the alignment pin in the spring. Stacked shims are okay as a temporary experiment to see if you are happy with the results.

I would cut and reweld the perches but I have easy access to the required equipment to make that easy.

[Lemans1]

Yes it does have lowering blocks on the back. Great idea to machine them, thanks. Think that's the route I'll go.