-1* pinion angle is a good start. where do i go from here?

With the poly bushings you will still get some deflection, I'd start at -3 degrees.

Adjust it while watching your 60' times. -2° to -4° usually works best with more angle on the 5 speeds than the autos - they don't hit as hard.

Ditto that. You'll know to play with it if the rear hops or you feel vibration from the U joints going down the track.

BTW, your email address didn't work for a reply so I'll paste it here.

I axed the Capri, literally chopped it up and tore the
cage out of it before turning it into scrap. I just
got pissed that it was sitting there not running and I
felt I was wasting my time working on it when I have a
'69 fastback 390 stang in the shed half restored.
Couldn't sell the capri so I parted it out. I'm going
to cut the RS decal and 351 turbocharged emblem out of
the fender and mount them on the wall of the garage.
Pretty sad really, but you only have so much time to
play.

Jamie