As far as will it pull it ,yes .I've ran the same 48" hard nose that' s on the avatar picture using .404 full comp chisel on my 125's which are stock with 8 tooth rims .They don't have any problem with it .
That bar is an odd ball NOS McCulloch most likely made by Windser .It's got a 58 thou slot,hard nose of course .Mike Acres thought it might have been for a gear drive which I've been told the old 1/2" chipper it would have ran back in the day came in.063,.058 and believe it or not in 50 thou .I was just a kid at the very end of the gear drive era so I really would not know .