7 1/4 to 8 3/4 swap in A-body

Greg, The pinion angle is set by where the spring perches are welded to the housing (as Red stated it can be adjusted with shims but in a stock application the perches set the angle). Your concern would be true if the same housing was being used with a center section that was longer (requiring the drive shaft to be cut). But in this case the entire rear end is being swapped. An A-body 8.75 goin ginto another A-body will all ready have the perches welded on so the pinion angle will be where it needs to be.