Terry,
You can do a search on this topic. Just go to the blue "search" heading in the bar above. There has been much discussion and some of it has been fairly recent.
The best I can determine after having read all the posts is the following:
a. Radials ride better
b. Radials may have some issues owing to the flex on the rim.
c. Radials may have issues of keeping pressure on some old rims.
d. Regular bias-ply tires are good and deliver good service.
e. Regular bias-ply tires are closer looking to the original.
f. Regular bias-ply tires are a little cheaper.
g. All in all, its about six of one and a half dozen of another. You know.
Others will likely advise you on the above and may have a better take on the subject and you attending questions that I.
I recommend the B.F. Goodrich. They seem to hold the white wall color well and are fine for most applications. Get new inner tubes.
Firestones are merely a personal choice and seem to be the favorite of those rascally Frod folks. That's reason enough to stay away from them. Grin.
Good luck,
Charlie
BTW: I'm told that the BFGs do well on either side of the road and upside down.
BTW2: They ain't "tyres." They be "tires." Or in MrMack or Tiny's lingo, "casins."