[Cobranut]

Jason,

A couple things to consider:

First, were you looking at the fenderwell to tire clearance when you first noticed the difference? Unique's body molds trace back to an original Cobra body, which were hand formed, therefore your body is not exactly symmetrical. I have about 1/2" more clearance on one side than the other, I don't recall which is higher.

Second, where you measure frame to floor, did you check the floor? It is extremely rare to have a concrete floor which is flat over any appreciable area. Use a long rigid straightedge and a good level to check the floor, paying attention to where each tire sits and each measuring point.
A surface plate and wheel scales are needed to really set up the suspension accurately.

I found my frame to be very accurate as far as any twist front to rear.

Good luck,
David