To all,
On Wully Bully, we lowered the front lower mounts, so that the lower arms are essentially level. We also have upper frame brackets that have multiple holes. On the rear-end housing, we have stock location holes, and holes further up. All of these locations we have plotted into a great computer program I bought, which plots out the instant center. We ran Wully Bully for years, with very poor consistency on 60' times before we knew about and bought this program. After learning what we did wrong, we re-engineered the suspension as described above, and now produce consistent 60' times of 1.40-1.42, on 10.5" tires. I have used this same program to offer advice to Carl's set-up on Wully Bully II, which does 60' times of 1.29-1.32, and also Ray (Dynoray) and Aubrey. I will be glad to offer any insight to others, but it takes me time to do it. As far as pinion angle, exactly as Fatride said, you only want enough to equal the movement (twisting) of the rear on launch, so that it equals 0 degrees. We run more in Wully Bully than in Wully Bully II, because II has a more modern four link, that allows less twisting of the rear housing.
