building a long distance touring car

I have a '68 convertible Barracuda. It gets 17 mpg at 70 mph with the top down, and the A/C blasting. It gets a bit better with the top up. I guess it would hit 20 mpg if I could put up with going slower on road trips, but with a Valentine 1 on the job.....why suffer.

I run a 408 inch 5.9 Magnum stroker with massaged Eddie heads, 10.2 to 1 compression and a lopey .575 lift hydraulic roller spec'd by Dave Hughes.

That spins a 3.91 sure grip through a Stage 2 200R4 from Extreme Automatics via a 3800 stall lock-up converter from Precision of New Hampton. The lock-up is like having 5th gear.

It out runs stock tire'd Hellcats in the quarter, because it gets out of the hole very hard street or strip. It's dead reliable, a daily driver and put's virtually everyone right in shock when they try to run against it, except 4WD Nissan GTR's etc.

It's the unusual combination of the EFI and the awesome trans, the nearly perfectly matched torque converter and the Nitto Drag Radials. Oh yeah, the properly adjusted slapper bars are painted black, so I don't have to hear how they don't work on Mopars as much after I beat them.

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How tall is that tire?