Another pinion angle ?

What is a good pinion angle for my setup? This winter I have been pugging away at relocating the springs and mini tubbing the car. The car is street driven but does hit the track at least 5/6 times a year. Specs are listed below.

72 Demon with a mild 440 4 speed 8 3/4 3.91
Subframe connectors
SS springs 002/003 relocated
Comp engineering shocks

Not that it matters but best ET to date is a 13.07@103. That was before the frame connectors and had stock springs and location. Hoping and have been told, these current mods will make a huge difference. Fingers crossed.

Thanks for any info!