[cmpski]

I run two sets of of 6X16's on my 67. 15 years ago I had a set of 16's done up to closely match 15's cosmetically. I was told 6X16's don't look correct on long hoods. Yes if you don't change the cosmetics. I've shown my car maybe 50 times over the years and only had two guys notice they weren't 15's. I think guys like to go with 7's so they get the wider lip look on the wheels. I get a similar look by not running paint up the lip on the 6's, as you can see on the wheel with the Firestone tires. I doubt there is much of an increase in performance going to 7's. Both sets run 195/55/16's at 24.4 inches. 195/60/16's are the same 24.9 inches as the 205/55/16's but only offer all season and winter tire offerings. My tires have 350 and 200 tire wear ratings. The 200's being the sticky ones. 205's, 811 rpm, 195's, 825rpm. That's only a 2% difference. Your 7's have a 25mm offset and the 6's a 36mm offset. That pushes the outside part of the rim outward to a point that 195's might be your only option with the 7's on your particular car. These older cars are all a little different from each other. Or go 6's with 205's. Or roll the lip which you say is not a option. Your choice.