I bought a set of take off 10.5 x29.5 from the same guy as Dartin. Put them on my 64 Belvedere N/SS car, 2 box stock Eddy carbs @ 3345lbs 1.290, 5.79@118.6, 9.127@147.58. The tires lowered the mph a tad but the early end of the track continues to get better. Considering the car has 185 passes and started at 9.42@143 last spring I'm pretty happy. The converter, engine, cam timing, lash have never been messed with. All tuning done with trans component lightening, shock/ladder bar/tire psi tuning. Even won a couple. Looking forward to next year.
Doug