What size 17 in rim will work on 68 Dart Converitble?

I have a 67 Dart post car with mini tub and moved the springs in.. Im goign with 215 45 17 front front and not sure about the back I would like as big as I can get any one have a set up thats simular.. any thoughts Oh I am also looking for a small block bell housing for my 360
this is THE BEST A BODY site online..
thanks guys!!