dont rush this process. its only going to cost you more in the end. if you have the coin to spend, then go for it. if you want to save some, slow it down some and dont waste 6500 on a 64k km engine (that is way more than i would pay for an LBZ engine regardless of miles, so many unknowns there).
A socal engine would be a great way to go for a drop in engine and save you time/headache. otherwise, get that engine in the truck pulled, have it torn down and see if that blown piston cyl can get by with just a .020 bore or if it will need a .040 bore. you need to know this since you will most likely be changing pistons. with 258k miles (400k KM), your piston to wall clearance is going to be high even before a hone to clean up the cyl that lost the piston. i would just plan on boring it at this point.
What is your realistic end HP goal, how much will the truck get driven and at what HP do you want to DD on?
A socal engine would be a great way to go for a drop in engine and save you time/headache. otherwise, get that engine in the truck pulled, have it torn down and see if that blown piston cyl can get by with just a .020 bore or if it will need a .040 bore. you need to know this since you will most likely be changing pistons. with 258k miles (400k KM), your piston to wall clearance is going to be high even before a hone to clean up the cyl that lost the piston. i would just plan on boring it at this point.
What is your realistic end HP goal, how much will the truck get driven and at what HP do you want to DD on?