I think I found a good place to get a remanufactured oddball engine such as a 235, 261, a Pontiac 239, 251 Desoto, etc. Their called United Engine Specialists. I found 'em on Ebay Motors. I was interested because I didn't think you could even buy a reman 235 or 261 anymore.
Don't know a thing about 'em but the engines are really neat. Cool!