Wheel and tire question for 68 GTS

I think you would barely notice the look of those 2 sizes. Now get really crazy like my profile pic before I started my project, I think those were something like 215 75 14 up front with 275 50 15 out back. I wouldn't recommend 275 unless you were to go with the offset spring kit & correct offset wheel, because when I was young and didn't care, I went to town with a sawzall on the Qtr/Tub lip.
Very nice looking car BTW.