Richard, in looking at the pictures of your car when you got it, I don't think you had tires like what are on that Oldsmobile. Yours were L78-15 tires and were not as tall as the 8-ply you are thinking about using. I think you may be disappointed in the height after using them. I have the L78-15 bias ply dual stripes on my Victoria. They are exactly what shows in the factory literature for 1972. I bought mine from Coker on a Tuesday and they were stacked on my porch Friday.
As far as bias vs. radial opinions, I think there is a difference not yet discussed here. Tire age. Putting new radial tires on a car makes for a nice ride and all but so does putting new bias-ply tires on a car. I have driven cars with old bias-ply tires and new bias-ply tires. Just like any tire, once it is old, it may still hold air, but will not perform as when new. I have been happy with the performance of my new set of period correct tires.