'67 bell housings should have the same pattern across all GM products in that vintage. L6s SBCs and BBCs. What engine/tranny are we talking about here?
When the SM420 was changed in '68 production lines to the SM465, a bell housing with a bigger front hole came out. The '67 bellhousing GM p/n:3815891 has a 4-9/16" Diameter. The '68 bellhousing, p/n: 3925505 has a front diameter of 5-1/8". The back-end mounting holes are all the same.
Do you still have the broken-off ear? A welder friend tells me that it is a soft, forgiving casting that can be welded back on.
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.
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