Tire question
I don't know much about the "new" street legal tires, but the ET Streets aren't radial.
Anyway, I ran MT SS's on a hi-14 second 72 340 Demon years ago before the newer stuff was available. I ran the G60-14's. They worked better heated. I didn't have much power, but there was zero wheelspin compared to the G70's that were on it before.
I would think that they would work better with 30 psi or so, since they are constructed like "regular" street tires. I had my rallye's widened to 7 1/2 inches to spread the tire out. I ran normal street pressures.