I don't think he'll be able to change the pistons with the engine in the truck... don't think you can get the oil pans off to get at the rod bolts to get the pistons out... engine hasta come out I think. That being the case, I would strongly consider LB7 or LLY pistons instead of going back with LBZ pistons. I'd also have them delipped and coated if money allows.
thanks for answering the question.
he plans to go back with delipped and coated lb7 pistons, some aftermarket rods and main studs.