Here's What I found:
4:12 WHEELBASE (Jan. 6, 2010)
Minimum 85 inches, unless car has original engine in original
location and is shorter than original, or noted in class requirements.
Maximum wheelbase variation from left to right is 1 inch, unless
otherwise noted in Class Requirements.

I'd call your divisional office and try to talk to a tech guy. If the car is otherwise safe, I wouldn't be too concerned.