Hi Hunterdude . . .

Tim's Trucks page has a got a great write up on 261 identification and addresses the captains bars controversy:
The Forgotten 261

I particularly like the detailed tech tips around the changes to top end oiling system: Rocker Arm and Lifter Oiling

BTW 261 engines never used poured babbit bearings . . . though technically insert bearings "bearing surfaces" are made of babbit material.

regards,
stock49