New addition to the stable - 83 Ramcharger - questions, too

So, the old 98 Ram is getting really rusty. I was cruising Craigslist not really looking to buy, and found a 1983 Ramcharger that was very clean. 318, 106K miles, 2WD, aftermarket A/C that works. The plan is to learn body work on this thing and also to eventually drop in a big block. It is very solid, owned by an 89 year old mechanic until he passed away. It turns out he lived in my home town, about a mile from me. I never knew. The only bad spot on the truck is the rear quarters are going to pop through with rust holes very soon. I need to know where I can find inexpensive repair panels. Also, I don't have it home yet, so I don't know what tranny and rear end the 2WD version comes with. Anyone have any ideas on where to find parts and what to look for?

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