crossmember from a catalog should work, if your engine has the bolt holes on the front, you can get reproduction original style front mounts online (have seen them on Ebay).
I was thinking abouth that same swap today while driving my 58 2-ton to Eastern, Wa (Omak). to pick up another cab. Mine got a 327 put in it at some point in the past, it is a bit under powered I think, and only got about 7.5 mpg today. Would be interested in seeing what you get with a newer engine!
