bronze lifter bushings

I'm guessing maybe he was honing the cylinders and in the course of blueprinting the block he found the lifter bores worn? It makes no sense to me to hone lifter bores on a used block.

If the lifter bores are out of tolerance then bushings are required. Hydraulic lifters and/or Magnum heads require that oil holes are drilled in the bushings to

A: Feed oil to the hydraulic lifters.

B: Feed oil through the lifters and pushrods to oil the rockers on Magnum heads.

It's up to you if you want to replace them all. It won't hurt anything but won't make anything faster other than the money out of your wallet. I suppose if you plan on keeping this block for a long, long time you should just have them done.

The machinist honing the lifter bores still creeps me out though.... I've heard from a couple very reputable shops here that most MP blocks from the factory require lifter bore straightening which, of course, requires bronze bushings and a hone to size.