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