Several ways to do it but, I am going to install engine and transmission, set the car at ride height, measure then place on jackstands or ramps. The rear is bolted in snuggly but to where a deadblow hammer will still allow adjustment. Take transmission yoke angle then pinion set to angle needed and tack weld the perches. After that I will finish the welds. You shouldnt set pinion angle till you know what your transmission yoke angle will be @ more or less your ride height.
This is the step I'm at on my 68.
