Are the headgaskets & rockerarm assemblies the same from 1952-64? If they are then you're in business. It probably couldn't hurt to grab a 223 & see what will interchange. This would go a long way toward getting parts as the 223 was a rather common motor.
You may already know more than what I've got on my site, but here's the address to my Ford I6 site:
http://www.geocities.com/edwins63/I6ID.html This sounds like an interesting prodject as you rarely hear of the 215 (one of fords first OHV motors, only made from '52-3). Let us know how it turns out. Take care,
Edwin
'63 & '65 red tudors
