A body 8.75 dimensions needed

If it's too far down, get some angle shims for between the spring and prech to bring the nose up.

If you were running a SS spring and and needed a lot of pinion angle, then doing it at 90* angle is likely OK. Street cars usually don't need that much down angle on the pinion. Effectively you've rolled the pinion down 5*.

If you don't know the angle of your trans output shaft, it's a crapshoot to get it right.