i have a 1976 m880 that i want to put a 6.2 into what all will i need to do it, and what transmission should i use to connect to the Np-203

i decided to go with the SM465 with a NP205, what will i need to wire up the 6.2

The 6.2 needs one +12v wire to run, the glowplugs will have to be wired up, and if you want the cold start system you can wire it up as well.

The one wire the 6.2 needs to run is the fuel shutoff wire, it hooks to the top of the injection pump.
the glow plugs can be wired up to a push button type setup, This has been covered here many times
The cold start has one wire that goes to the top of the IP for a timing advance, as well as a wire for a solenoid to kick the throttle up some.

i got my engine all ready to drop in