I'm looking at tires for the rear of my 70 cuda 426 hemi approx. 600 hp 4-speed 4:10 strange s-track calvert split mono 9 way shock cal-tracks and QA-1 double adj. front. 3800#s without driver

Current nitto 275/60/15 worthless even at track.

It looks like the only tires that will fit are MT. ET. SS 275/60/15 or MT. ET. 28X11.5R15 bias #3554 or QTP 17601.

97% street driven is it worth the rough driving of a bias ply for traction over a better riding and poorer grip radial?