Center Rail Clearance- No less than 1 3/4 inches minimum Is that going to be from inside of wheel to the inside of wheel or the width of the block?
The 1 3/4" rule is the underside width clearance, not necessarily just the wheel to wheel, wheel to peg clearance. PWDR uses the Lisano Enterprises Check Fixture with a custom center piece that is 1/4" tall and 1 3/4" wide. As long as the car clears the fixture, you are good to go. So if anything else hangs below the car body, like fenders, make sure there is still 1 3/4 between them or the car will not pass inspection.