How to Assemble the Front of a Small Block

Howdy.
Just reading this thread and I have a couple of questions. I have a couple of engines here at the moment so I've just been out to check. Two of then have after market twin row roller chains and gears but no oil slinger, one has the standard chain and gears and an oil slinger. Is there room for the oil slinger to still fit with the wider bottom gear? Wonder why two people would have left it off?
The second question is wouldn't it make more sense to put the bolt with the lubricating feed hole on the lifter gallery side so it has a bit of presssure?
Cheers