The upshot about all of this is, that the J body that I wanted to get the windshield for is still without a good windsheild, but I now have two others. The original car is a Blue base 1982 Mirada, pretty much loaded (except for the tilt wheel, cruise control, and rear amplifier), and is a 318 2BBL. In my efforts to get a windshield for it, I ended up buying a Heather Grey Metallic 1980 Cordoba Crown coupe (loaded, everything except the rear amp), and a red 1981 Mirada CMX (also loaded, with rear amp, no cruise control, and this one is a bucket seat/console car, the other two are 60/40 split bench/column), both 318 4BBL cars. I bought one, hoping to get a windshield for the base Mirada, and ended up with 2 even better cars, both in terms of engines and in terms of condition. I paid less for the Red CMX than I did for the Blue Mirada base car. Life does that, I guess.
Blue car may end up being converted to a Big Block, if I can find a windshield for it.
Kostas