Foot brake drag racing

Here is a picture of my junk.............. straight out of the make shift paint booth in my shop.
3100 Hughes stall, Pro built 727, 4 wheel manual disc brake, 410 CID, Ford 9 inch 350 rear gear
for street ability purposesView attachment 1716349977 View attachment 1716349976View attachment 1716349978View attachment 1716349979
What size tire is that