Hey guys just wondering if anyone has or is using the darton dry iron flanged sleeves for boost? What is the max amount of power can these sleeves handle along with a cnc machined block guard?

First off stay away from a block guard of any kind, they cause more problems than they help.
Second the dry sleeve is basically a stock sleeve liner replacement. the old sleeve is bored out leaving the aluminum then the new dry sleeve is pressed in. It may handle a little bit more than the OEM sleeves but not much. If spending the money in machine work just sleeve the block correctly with full wet sleeves Darton MID sleeves and Golden Eagle are the best IMO.