yeah I've had a full engine rebuild but with bells and whistles added ;)
if your thinking of a rebuild there's a few people you could talk to Thor racing, prolex, TDI these should all be able to help it just depends on how far/crazy you want to go and how much money you have to spend at least if you talk to all 3 you will get a ruff idea of how much a rebuild could cost
you take a bit of a risk when buying a 2nd hand engine off of someone, but if you know the history of the car it can't be bad, but I found a few dodge sellers on ebay,
have a chat with some of the Irish boys on Tezzaworld as they may know of a right off you could use as a donor vehicle
I thought about getting a MR2 turbo engine and dropping that in but wasn't sure how much of a problem it would be marrying up the gearbox and other bits