Flywheel Balance?

Pretty sure that is too big to fit a passenger car BH.
Have you actually counted the teeth?
No, but I will count the teeth tomorrow to be sure.
Have you looked it over very closely for a casting number?
I have not seen a casting number, but I will double check.
Most all my neutral balanced 10.5 130 tooth flywheels have the scalloped cut. The thing that lets me believe it is a 440 six pack or heavy rod flywheel is the two small balance holes it has drilled completely through as stated on the first page I posted above.

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Thanks for posting the larger picture. I never noticed those extra two drilled thru hoses.