On your truck, it'd be easier to pull another CPU and fuse box from a junk yard, and insulate them in a grounded ammo box. Pre OBD II typically does not have enough sensors other than the CPU and fuse box that'd be fried in an EMP attack.
^^^what he said keep a second cpu ready and practice swapping it out.
You sir, are a specialist in the art of discovering a welcoming outcome of a particular situation....not a mechanic.