Bell, clutch, trans, crossmember, possibly driveshaft work, pedals, clutch set up either cable or hydraulic, shifter set up, speedo drive set up.

Ford truck 5 speeds would be a miserable and short-lived choice, so you are looking at a TKO or T56.

TTC: TREMEC Transmissions

Modern Driveline - T5 / TREMEC TKO Transmission Conversion - 5 speed & 6 speed solutions to swap your Ford Mustang, Falcon, Cobra, Hotrod into Overdrive! Performance Parts

Rockland Standard Gear Manual Transmissions

No you can't take a T5 out of a Mustang and expect it to live in this application.