Tire sizing question - 66 Chevelle

[class67]

I am in mock up phase on my 66 Chevelle and need some opinions. I was going to run a 335/30/20 in the rear, but after setting it in there, it is a little tight for my liking and am now thinking of running a 325/25. This will give me roughly a 1/4" less in width and 1.5" shorter, which might work out a little better? my other concern is that I gong with a 255/35/19 in the front which works fine, but now I'm wonder if I should go with a 30 series up front in order to keep an 1.5" differential between the front and the rear? or does it really matter???

Looking for opinions.....