I've got the 273 coming out of my '68 Dart as well as a spare block sitting in my garage I picked up for free. I highly doubt anyone will want to buy it. I've seen running ones sit on CL for months priced at $100-250. When mine comes out, I think I'm just going to rebuild it for fun and if I ever find a slanty car throw it in.
If you ever decide to part it and the crankshaft still looks good, I'll take it.