Check the local junk yard for one... I bought a couple for under 500 with damaged blocks to get the internals, heads etc. You can usually get ones that were in fires for cheap too.

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram