On the other hand

Uhhh.....
$1000 to rebuild a transmission for a slant six?

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You can BUY a good used 318 and 904 for less than that. Holeeee crap!
Are there no self serve junkyards near you? The 84-89 Diplomat-Gran Fury-Fifth Avenue cars had 318s, 999/904s with the low gear 1st and 2nd and can be pulled from junkyard cars for under $500 total. You would be way ahead by considering this rather than what you're doing.
There is only 1 Yard that has any Mopar in the area and it's just over 60 miles from where I live the next is about 150 miles and the Mopar's they have, have no engine or tranny's .My driver's side door is creased to the point if it been any more the window wouldn't role down. The yard the far one wanted $300 for the door no guts or window. Prices are outrageous out here that's why I'm Glad I found FABO I've gotten some parts that are hard to find here or the price is high enough I just about pass out when I'm given the price. The place that did the rebuild put a shift kit and guarantee I could do engine 30 over with all the bells and whistles and his rebuild could handle it I figured that was good?