yea, i have a 223 for sure, been lookin at it for almost 5 years now... front dist. the one in question is a 54 block, i also have a 55 truck block that had the hex drive pump
odd that no one else has seen a sloted drive pump or distributor before... the blocks are the same from what i can tell here, so i'm going with the assumption that the pumps and dist will interchange... i also have a couple core distributors here that are about 50/50 sloted and hex...
we'll see when i tear down the 54 block, i'll know if it'll be able to accept the hex pump housing from the truck block
thanks much