Latest tire 1970 Swinger with mopar off set shackles can I fit a 275 tire?

On my 72 Swinger ... 15x8 4.5 backspace ... straight hangers and shackles ... 245x60x15 ... 1" clearance to the springs ... 3/4" to the rolled fender lip ... 1 1/2" to the bottom front of the fenderwell (the tight spot we seem to often forget) ... 275s are about 1 1/4" wider and 1" taller