It's simple, you need everything that is emissions related from the donor vehicle installed and functional on your 40. Most struggle with the EVAP system but IIRC the tbi set up is pre-OBD so it should be a pretty easy process. Howell should be able to tell you want you will need.
1994 FZJ80. Elocked, MAF 3/2 Lift, BFG 315 KM2s, stock 4.10s, ARB bullbar and a Warn 8074 winch.
powered by an all-aluminum 335hp L33 Vortec V8
2004 Kona Stinky dee-lux.