I'm all kinds of confused - is this thread is about an engine swap but also about points for the 2.8L?
If your distributor has points, then it's been swapped in from a 74. Anything from 75-78 uses the Duraspark ignition and you'll find the boxy-looking module
@extra_stout has posted above mounted on the driver-side inner fender with a set of wires (3 I believe) going to the distributor.
The points distributor has only the ground-wire coming from it and going to the coil - the connector plug looks similar to the one in the picture above but it only contains one wire. If you just need new points, get them for the '74, RockAuto has them for about $5.
I know all this because my '78 II 2.8v6 came with a bad engine but with a complete replacement engine from a '74. I swapped over the distributor from the '78 to the '74 engine when I installed it so I could keep the electronic ignition.
If you have the 74 model and just need the points you can get them. If you need a complete rebuild, you'd want to pick one of the rebuild options under the '74, depending on whether or not your distributor has vacuum retard. You can also still get one new.
https://shop.advanceautoparts.com/p/cardone-distributor-31-968/5630282-P
If you have the 75-78 model (electronic ignition) those are usually pretty indestructible (the module on the inner-fender on the other hand is always a failure waiting to happen). If you do need a complete rebuild of the distributor, that's the D4028. You can also still get one of those new (I bought one of these 2 or 3 years ago was a perfect fit);
https://shop.advanceautoparts.com/p...c-w-o-module-domestic-reman-30-2691/5630517-P
Advance Auto also carries a Pertronix brand electronic distributor for the 2.8 if you're so inclined though I have no idea if it actually fits (you'll see a lot of v8 stuff mis-listed for v6).
The 2.8, believe it or not, has really good parts availability thanks to it surviving so many years, and being used in the Bronco II and Aerostar. You just have to get creative searching sometimes as many catalogs don't have what you need, but I guarantee you can still find it.