I doubt if anyone is interested, but just in case...  A man outside Medford, OR has a 256 Merc, long block less intake, and I can either give you his phone number, or go over and purchase the engine on your behalf. 

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.