I actually had these 325's on the same wheels with 4.5" backspacing, and they fit just fine. They were slightly proud of the lip and I wanted to tuck them in, so I could adjust the coilovers for a better launch, so I went with 5.5" backspacing. You'll have to notch the frame to get a 5.5" to...
She's about to get a little lighter tomorrow. I'm swapping the stock front brakes, shocks, and Eibach springs with Aeromotive brakes, drop spindles, and QA1 R series Pro Coilovers
Fronts - 17x4.5" Weld RTS S71B with 2.20" backspacing. Tires are Hoosier 27.5x4.5-17 drag front
Rears - 15x10.33" Weld RTS S71B with 5.5" backspacing. Tires are MT ET Street R's 325/50R15
I sent Steve my info on Facebook earlier.
This was one of my license runs and my first pass after installing a 6870CEA Gen2 at 28psi
109 block stock stroke girdled
GN1R race ported heads
car weighs 3236lbs without driver
Here's a vid of that run