before you purchase anything.
read all of the "newbie" sticky threads.(located at the top of the IDI section)
lots and lots of NEED TO KNOW information.
especially threads on cavitation.
sounds like you want to bring this truck to bran new status.
IMO, having a block sonic tested is a MUST
knowledge is power.
if i were you, i would read all that i could while on deployment.
purchase another block when you get back and work with that while youre driving your truck and learning more.
when its time, you can do a simple engine swap.
playing with your existing engine will do nothing for you but gain information.
wouldnt want you spending all of your perdeium incorrectly.
you work hard for that ****!
COME BACK SAFE!