Moving rear end back

On my 67 Dart I moved the rear back 3/4" by redrilling the spring perch hole. I needed a driveshaft cut anyways so it made sense to move it back. Shock plate hole had to be notched and when I installed the fuel tank I kept it as far back as I could for shock clearance. Car handles very good street and strip driving. If you do this triangulate your measurement off the torsion bar cross member to get the rear straight.
I run 255/70/15 29.1" tire on the street to kill the 3.91 gear. 27" drag radial at the track and the car hooks with a 1.65 60'. Mancini Racing SS springs and cheap Monroe gas shocks.