On my 67 Falcon I use 28x15" slicks on the rear, or Hoosier 275-60x15 drag radials, although I prefer the slicks. The tires are Hoosier 18150D06, 28.00 x 10.00-15. I run 12 lbs in the tires. The wheels are 15x8 with 4.5" pack space and a tiny .125 thick spacer. The inner fender lips are rolled. The leaf springs leave a tell-tale run on the inside sidewall when moving around. Older M/Ts would grow enough to have rubber deposit on the very rear edge of the rocker panels at the wheel well front. The Hoosiers don't do that.
Suspension is stock rear leaves (yea, still on Mama Ford parts) with Caltrack bars and Rancho shocks set on 7. Fronts are 90/10 Comp Eliminator but will soon be Aldan American single adjustable coil overs. I'll eventually switch to Caltrack monoleaf springs in the rear, just because one day those 57 year old springs are gonna do a Blues Brothers complete disintegration one day LOL. With good air and a good bite, it'll leave with about 1" air under the front runners. Car runs 7.3x~.4x depending on where we are and the density altitude. Eventually we should pick that up about .75 with a new motor.
Car weights 3250 with fuel and driver. DR use 16 lbs. On tracks with minimal prep and/or way hot humid conditions like we have here, it's slicks. Roll gently through the water past any puddles if possible, burn until bite - maybe 5,6 seconds - then stage.