#1 EGT, otherwise known as a pyrometer.
#2 Boost gauge. Get one that goes to 50 psi.
#3 Cam plate. Dont get one too wild, or you'll need to do the transmission (if you have an auto) or cluch if it's a stick.
#4 Piers' governor spring kit. Some might say this is #3.
#5 370 injectors.
#6 Time the engine to between 15 and 16 degrees.
Depending on who you talk to, #3 to #6 can be mixed up a bit. You'll also need to do transmission/ cluch work before you get to #4 depending on how healthy it is now.
By the time you get to #6, depending on the cam plate, you should be well over 350 HP.
You might also need a 16cm2 housing on the turbo if the EGT's are getting hot, or if you tow heavy stuff.
Eric