You would have to change a lot.
Pull front gear cover, cam gear or gear and cam together, remove gear case and reinstall 2nd gen gear casing, p7100 pump with gear, 2nd gen inj lines, brackets, throttle/transmission lines, lift pump, fuel filter housing and some small stuff.
You can leave the 1st gen head on the truck, but they don't flow like a 2nd gen head so without changing it for a 2nd gen and modifiy 2nd gen intercooler into truck with 2nd gen boost pipes and hoses you won't be taking advantage of more power. Don't forget replacing transmission if its a std and if its a auto you would have to have it built right.
As you can see its not a small job. Better off replacing motor/trans with 2nd gen if you aren't going radical.