Tire conundrum

Howdy folks, I am sure this has been discussed before. I just bought new tires for my stock 67 Barracuda Fastback. The rears are BF Goodrich 245/60R/14's mounted on old school Cragers. Went from 225/60/R14's. They rub when I hit a good bump or dip in the road and I have a couple of options as I see it. New rear springs to get ride height back to what I think it was when new??? Just shy about a couple inches I think, longer rear shackles, or last option air shocks. Do y'all think any of these options would be best over the others? Do leaf springs really sag that much, or would they make that big a difference in curing my trouble? Rolling the inner fender area is really not on the menu at this point.

Air shocks I thnk would tear up the mounts after a while, and I would not put a bunch of pressure in them, just enough to make the clearance issue disappear!

I need y'alls input please! :banghead:

Thanks everyone!
John D. Beckerley
A.K.A Fish That Kills
Ausrin Texas