Dave, thanks for the info and the Group #.

Here is the Bushing 0.334, in the 54 catalog.
Bronze - 3/4 I.D. x 25/32 O.D. x 15/16 length
http://chevy.oldcarmanualproject.com/1929_54chevyparts/00/104.HTM

Also, note Arm, Valve Rocker 0.333,
1929 thru 1940 w/bshg.

-Tom

1950 Chevy 3100 w/ 1956 235