William, (rear tire clearance) I've got about 1/4" on the outside. A solid inch on the inside, maybe more. The wheel wells are 14.25 wide and could theoretically hold a 335. Since I was limited to a 265 up front, I stayed at 315 to keep the tires in better balance.
John I admire all the work you have put into II much. I have loved the 66-67 Chevy II body style for a long time. I have also loved the G-machine/Pro-Touring build style but could not combine my loves into a car build like you have managed to do so well. Keep up the great work and keep the pics comeing. You may yet inspire me to actually attempt to turn one of my Chevy II's into a G-Machine.