I have the 700R4/NP208 but I'm keeping the 6.2L and putting a manual transmission behind it. The tranny still drives, but slips in reverse and won't go into overdrive right now. I pulled the pan and found a lot of metal in the pan so it will need rebuilt. Many of the tranny pan bolts were stripped out as well and will need helicoils.
I had also arranged to pickup a free core 700R4 in Portland that I haven't had a chance to get to yet and won't be needing now as well. This one needs to be rebuilt as well, but might be a better start than the tranny I have now.
I do have another motor that quit running in a friends 1983 GMC truck that I will be getting in a couple weeks. Motor ran good for him then quit starting one day. My guess is the injector pump failed, but rather than fixing it he bought another truck. I'm getting half the truck on a trade.
I think I have the parts your looking for, but I'm near Seattle, WA instead. If there was a port to drop them off at up here I could ship out of Seattle. Could make you a good deal on a motor, 2 tranny's (probably need both to make one good one) and a good NP208 with all the misc parts needed for all of it.