I wonder if its actually an 86 EFI that someone did some mods to? Could it be he has the wrong year listed? I mean we are assuming he's correct on the year...so...
1988 F250 Supercab Longbed 7.3 IDI, C6, 1356, GEARVENDORS, 4.10 Sterling with autolocker
1986 F150 302, C6, 9" 2.75, Wood Flatbed