69 Dart 340 Swinger Street/Road Race build

What size tires are you planning on running on this road race build?
That i'm not sure on that yet. I'd like to run 17"s but it seems to be popular to run 18"s for tire selection. I'd like to keep the car squared so the front end will really dictate the tire size. I will most likely trim the fender lips or even remove the lips and weld back in round bar to gain as much room as possible.