Pinion angle and diff centering

I appreciate youz guyz input on this.

One aspect i need to consider is that i do not have that big piece of fastback glass or interior in the car. To add to the situation, the tank is empty.

So ill add 150# to back end to see how much pinion rises from its current position and re calculate (or just wait until the friggin car is together more).

With trans down 3.5 and pinion down 5 that brings my total to 8. Minus what the pinion will rise under acceleration (traction dependant plus it's a street car) I'm guessing with SS springs, the pinion will only rise 4*.

That puts me a bit out at 4*.

I have the trans up a bit to get headers to clear steering gear so i could look into lowering the car a smidge in the rear and re check.

Thanks for listening, just writing this is helping me get my head around what is happening to the suspension under load/ rest.