Don-
I've seen 251 intakes and alloy heads now and then on E-bay, that's where I found my 230 Edmunds intake.
You could have one made by George Asche, like Don Coatney did over on the P15/D24 forum. George fabs them from stock intakes, and can make a dual or triple if your so inclined.
Langdon's is making stainless tube headers now, but there is a bit of a wait.
My 230 rebuild is the in the neighbor hood of $3500, but it is far from stock. I did all of the work asside from the machine shop labor. The Edgy head was $600 alone. Sure a V8 may be cheaper, but at what sacrafice?
Have a look at my site for my engine rebuild.
Pete
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Check out the restoration of my '50 Plymouth here:
http://home.rmci.net/blueskies/plymouth.html