Parts for 1985 Dodge D100 Ram

Guys, I know it's not an A body, but I have a beautiful 85 Ram with only 56,000 miles on it, 318, 2WD that I would like to convert from an automatic to a 4 speed. However, it is hard to find parts for these trucks. Does anybody have a manual parts truck, or know somebody who does? I would like everything but the transmission (am going to get an earlier 833 out of a muscle car for the gear ratios) so that I can perform the swap. Thanks! Also, my future plans include a 440 which means I will need a different bellhousing, but I would like to convert it first and drive it for a while. Thanks for any help

Will