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Seasoned Citizen
Can't give you a definitive answer specific to the IRS configuration but I think it really depends on how big you want to go, the wheel back spacing, and how far you're willing to go.
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Above is a photo of my car that uses a solid rear axle. I can fit up to 31" diameter radials (radials don't grow) or 30" wrinkle wall M/T drag slicks under the bobbed rear fenders. If I really needed more, I could manage it. I mounted my body ~1" higher in the rear, use a parallel four-link that allows adjusting the rear ride height much more than the standard FFR suspension will support. If I had wanted the IRS and needed to run tall tires I'm sure I could make the modifications to run larger tires.
So, my take on all this is it just depends on what you want and how bad you want it.
Dart Little M 406" SBC 800 HP N/A & 1,100 HP on nitrous, 2-spd Powerglide with trans brake, 6,000 RPM stall converter, narrowed Moser 88 3.90:1 spool with 35-spline gun-drilled axles & Torino bearings, custom parallel four-link, custom tube chassis & roll cage NHRA certified for 8.5-sec (only two FFR Hot Rods have this cert).
33 Hot Rod Super Pro Drag Racer Build:
33 HR NHRA Cert Roll Cage Build
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