Have a look at Copart.com and search for Dodge or Ram trucks that would be in the years that would have a Hemi. Find one close to you that is wrecked beyond repair but still has a good engine and tranny. They go for real cheap. You would get the entire setup that way.
Something like this.
http://www.copart.com/c2/homeSearch...e2s1&lotId=29727034&returnPage=SEARCH_RESULTS
There are lots of them with Copart yards all over the northeast.
Jack