Update time!
I pulled the trigger and made the 4500 mile round trip to get the parts car. I live in Madison, Wisconsin, and the car was just north of Seattle. It is also a '71, but has a 1300 engine (1300G?). It has the window, it has a good subframe, and tons and tons of other small parts I'll surely need. I also picked up an EA71, an EA63, and an EA61 short block. I'm back in business! Picture time:
The car is safe at my storage lot, it snowed a bunch while I was gone so I need to get everything re-organized over there. More progress to come!