Need measurement help 62 SWB..

[1G1YY]

I am trying to set up pinion angles using a T700 on a rolling chassis without any bodywork.

I will be fitting 4" drop coils in back.

I need to know the distance from ground to rear of lower part of chassis on a step with 235/75-15 wheels, as I note that there is a 3 degree variation of the rear end output shaft angle from from full compression to full extension.

If a member has a short stepside with 4" drop coils and could give me this measurement I would be grateful, so I can set that height on my chassis to get the rear end output shaft angle under normal ride height.

I am assuming the rear angle should be about 4 degrees but want to be sure before fabricating mounts for a Corvette C4 T700R4.

Thanks to those that can help with this..