Front wheel tire size Q

So I have a 1968 Dart 4 door, and I'm running 245/60/r14's in the back, on some 14x7 Outlaw II rims. I ordered a set of Outlaw IIs also for the front now, and want to wrap them with something smaller. I am trying to find out what would work up there, and possibly keep the big wheel in the back, small wheel up front - look, even though the wheels will physically be the same size. Rake is intended if that helps.



Basically how thin can I go ideally without it looking super wrong? I am not really well versed in tire sizes.