I disassembled an engine with the above combination.  The heads were EBV.  Johns site lists them as having 1.78 in. intakes but these had 1.64.  There was a late 2 bbl intake installed.  Looked like it sealed but barely.  Two of the narrower seal points measured .085 inches and .061 across.

This almost certainly was a throw together job by a large rebuilder.  Rods were EBU.  Head bolts a mixture of grade 4 and 8.

But the engine looked like it gave full service.  There was a 4 speed trans with hand brake around drive shaft, so it would have been an F350 up truck.

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.