Timing tabs also can be in 2 different positions depending on vintage. Early L6s have the timing tab at 3 O'clock [front view] and the later ones [late'70s on ?] are up at 11 O'clock. I found this out when I had to R&R the timing gear cover. In my case -- '67-'68 292 -- I had to cut off the timing tab from a later (blue) cover and cut out the tab from the old (orange) cover -- including 2 bolt holes -- and superimpose it over the new gear cover.


I/I #4101
'71 GMC Jimmy 350, sm465, np205,3.73 posi.
'68 C/10 Stepside 292 (.030 over) Offy Intake, 500 CFM AFB,Clif headers, sm465, 3.73 posi.
'67 K/10 454 project.
'72 K/5 rolling frame project.