Installed the last of the diff bushings, subframe bushing tool worked pretty well, a lot of hollow space in the stock bushing so should help reduce twisting under load now that ive installed solid UHMW ones in place of all the original diff and subframe bushings.
Got the diff back from Kaye Barrie today, huge thanks to him for getting it done so quickly, and sorting out the diff oil too. Installed it back into the car today, was a bit tricky getting it lined up with the driveshaft, axles and bushings all at the same time but managed to get there eventually with the help of a trolley jack. Removed the rear section of exhaust to make some more room. Got everything bolted back up and torqued everything I could up to spec. Car is back on the ground now, just waiting for the BOV vacuum line adapter still then I will take it for a test drive and see how it goes.
Next thing on the list, is long overdue XHP transmission tune and another wheel alignment, then the car should be pretty well sorted for a fun weekend/backroad car for now.