Here is my 59 block. It has "captain bars" on both sides. The 1/2" fittings for the oil hose is also a way to tell a later 261.
http://rides.webshots.com/photo/2490814160071636143DcYPwA


1962 Fleetside 4spd 235 w/O.D. posi 3:90
In the Stovebolt Gallery
1990 Subaru Legacy Wagon AWD 2.2 5sp
2013 Ram Tradesman C/V
My Webshot Photos]