Quick question about BFG Radial T/A's

I'm looking to get BFG Radial T/A P205/70R14 will they fit on the stock wheel/rim??

If you have the 14" × 5½" plain steel wheels or the rallye wheels, yes.

If you have the 14" × 4½" plain steel wheel, which was standard equipment with the slant-6 and 318 engines, then no, that wheel's too narrow. The 205 tire will mount, but you'll have rapid tire wear, poor traction due to the narrow contact patch, and sloppy (sloppier!) handling due to lateral roll of the tires on the too-narrow rims. 195/70R14 is pushing it on the narrow rim, and 185/70R14 is a perfect fit.

give me your opinions of the tire

It's a very good one for these cars. I've had multiple sets of them on multiple A-bodies, and I've been happy every time. They look good, too, with the raised white letters.