moving axle one inch backwards

I moved the rear end back 1" on my 69 Dart. I put Calvert mono leafs on with the caltrac bar setup. When I ordered the springs I had the locating pin moved back the one inch after talking with them. I was told that spacing the front hanger back will upset the rear shackle geometry and that will have to be changed also. My car is mini tubbed and I did test fit a 29.5 10.5w and didn't have any clearance issues. I'll try to attach a couple pics with the 29.5's.