I've run et streets for years and not once have I ever had a tube in any of them. I don't believe in the tubes, race tires get air added and taken out constantly, if they lose a couple lbs over the course of a day it's not a huge deal. Sure it sucks when I go in the garage and the tires are flat, but I deal with it.
For pewter's use, the tubes are a waste, and dead weight. Plus, if the tire shifts on the rim without screws to hold it in place the valvestem will get ripped right out, so much for that tube.
The Hoosier qtp's also aren't a bad tire, I had decent luck on the 27x11.5 size, I bet the 28x11.5 would probably work a good bit better.
These tires for pewter's car will be such a dramatic improvment over what he's been playing with, I bet he almost stalls it the first pass, he's never had anything resembling real traction in that car