I'm with TC here. A set of decent radials and alignment like he said (very usable specs for any rear wheel drive car, if you can get to them with the adjustability built into the car) will make a very driveable and enjoyable car.

I'm old enough to remember the last half of the '60s and the '70s well. Back in the day we couldn't wait to get to a belted tire. That's where the big difference was. Bias ply tires don't keep the tread on the road like a belted tire. The tread twists and lifts in cornering. Belts help keeo it even with the road.

Polyglas tires were factory stock on many performance cars, they had two fiberglass belts on top of some bias plies.

True radials have a more flexible sidewall so the belt works even better than bias/belted tires.

The tire's appearance is due to its ASPECT RATIO which has nothing to do with the tire's construction. The radial does have a little larger sidewall bulge due to the more flexible sidewall, but otherwise it's all aspect ratio.

Keep the antique tires on the trailer queens.

R.