well, I reckon I'll replace my front cv's. stock left and right side mirrors, stock rear view so I can take the legacy rear view mirror out. try and find a carpet kit, fix all the leaks in my car, repair the small amount of body damage, paint the car, and fix my suspension. then worry about whether or not I'll do a motor swap, that oughtta give me some time to decide if the car is worth my time upgrading, or just restoring.
ram engines gained 20hp and 10lb-ft tq with a carb, distributor curved and headers. imagine a cam grind, valves grinded, and head shaved. as you said, I cant marry another engine to my transmission, so I would like to get all the life out of my engine and trans as I can, and when they finally die, i'll think about a newer motor.
http://www.mttechsuba.com has plenty of replacement parts, as well as engines and trannys, they offer parts from early 80's to present. they are located in oregon city, oregon. I called them last year, and asked about clutch, cv's, mirrors, and motors, they told me they had them, but would have to call me back with prices.
I found out about them when I was working at safeway, a guy came in with an 83 turbo wagon, he said they sold him the turbo motor. he told me that they buy containers full of subaru parts, I have yet to verify if this is correct or not, but they do have parts for dang near any subaru.