My Son Don has a 291 Desoto that he will be building, probably to put in his 30 Ford Tudor. Desotos are the rarest of the hemis and share very little in common parts wise with Chryslers or Dodges, so parts tend to be hard to find and expensive. For example, he just found a 4 barrel intake (original) and it was $ 400. The aftermarket didn't really make a whole lot for them either, so when you do find an aluminum intake or other part it costs an arm and a leg.
Places like Hot Heads carry just about everything to build one, and they are very good about advice. However, anyone who plays with any of the hemis has to be prepared to spend a whole lot more than guys who play with Chevies, Fords, etc. I think Gastrick can attest to that fact.

Don