Yes, pretty much all of them.
Only the 83-mid 85 cars were non-WC. From 85.5 and up, they were all WC in the Mustang....even 2.3L's.
All it refers to is different bearings and 3-peice synchros for 1-4 gear. It's not any stronger...rated to 275 ft-lbs up to 1989 and 300 ft-lbs from 90+
Everyone confuses WC with Z-spec. All WC means is you have more parts to replace during a rebuild : (