DBurger,
You're right, the manuals are very hard to find. Once I decided I wanted one, I spent 3 years patrolling the web looking for one... here at the Eagles Nest, of course, but also on a slew of other online auto search sites. It just became part of my morning ritual.
During that time, I got a shot at exactly 3 Eagle wagons with the 6-cylinder engine and the 5-speed (all of them found on the Bay of E). I dropped out of the bidding on the first two at around $3000 (and they weren't even in very good shape).
Then one glorious day, I found a 1985 wagon in what looked like great shape, and the 'Buy it Now' price was $1000! I have never clicked on a button that fast in my life. It was in Oregon, so I had to buy it sight unseen and have it shipped to Sugar land, TX. I was incredibly lucky, because it really WAS in great shape. So patience does eventually pay off...
However, I remember that when I was your age, 3 years was about equivalent to 3 forevers, so I'm probably not cheering you up any. I would encourage you to just find a good automatic Eagle and 'convert' it, if you feel like you're up to it. It'll be a lot of fun, and you'll always find a lot of help and wisdom here at the 'Nest. And of course, the project will offer many opportunities to 'build character'...
Good luck,
JB