Offset Shackles and Hangers

Hey guys, it's going to be time soon to relocate my springs inboard on my Barracuda. I wanted to just cut the frame and move them inward, but I hear if you don't get this exactly right, the car will take off crooked and such. In order to avoid this headache, I was looking for some offset shackles and offset hangers as well.

Does anyone have some for sale?
Do you get as much clearance asyou would from just cutting the frame and moving the springs inboard?

Thanks for the input FABO! :D