Rob R is somewhat close to you, he gets 6.5l GEP-Ts from time to time, Let him know what you seek and he will keep you in the loop when he gets stuff in. The long block I got from him came with the engine harness that just needed some end fittings replaced and one splice done, the 4L80E and NP242.
After you find an engine you'll need either the GI TCM (about $400-450), or aftermarket TCM ($400 plus the sub cable), an A2 or turbo truck body harness ($500-1000 or the 39-pin Amphenol Connector assy ($75) to make your own 4L80E sub harness assy, the turbo dog house ($350-450), the left and right sides dog house opening trim pieces, ($100) A2 brake pedal switch ($60-100) ; 4-speed shifter assy ($350-500), Transmission LED light ($40) Depending on what truck you start with you will probably need the front body mount spacers for the turbo truck, needed to help make sure the turbo crossover shield etc on the block backside clears the transmission doghouse opening.
If you have limited mechanical ability, tools or work area, then you are probably better off saving a bit longer to buy an A2 4 speed truck from the beginning. Buy once, curse once instead of bleeding and cursing much more later, Paying one of the experienced HMMWV wrenches to do a turbo swap especially on an A0 truck is going to cost several thousand, I think Augi stated at one time it took about 100 man hours to upgrade his A0 6.2l 3 speed to a 6.5l GEP-T/4 speed.
Might be worth considering a non-running A2-series truck out of Albany, GA that you are able to inspect before auction, then just do the transmission doghouse opening alteration and GEP-T bolt up. But even in this case you will not be able to inspect every single mechanical and diagnose the gig that deadlined the truck, you are buying a Pandora's box, doubt you'd even be able to take 2 batteries to try to start them.
I got extremely lucky with my "non-running" A1 truck, it had been in preserved storage as a former Avenger ADA missile truck then was pulled to be issued to the Marines as a Maintenance Support truck, who refused to accept the Army Hand-me-Downs, because they no longer supported A0-A1 trucks, so she just needed two batteries, a gear shifter and fitting for the fuel filter inlet, started up after several minutes purging the air out of the system.
