Il duster, I am going to do the same swap on my 69 Dart, except mine has a 340, which is internally balanced. I have most all the parts to do the swap. When I get started, I will start a post with pic's and all the info I have on doing this. First thing you need to get, and probably the hardest to find is a good tran's, I personally would stay away from the OD trans. Look on craigslist Minniapolis, there is a very nice 4 speed on there right now for $400, may be able to talk him down a little. I picked my 70 4 speed up for $250. Be sure if you find one, jump on it, they go really fast!! Any other help you need or questions just P.M. me I'd be glad to help you out.
Jeff