67/68/69 cuda dilemma

So I ditched work and took a vacation day and went to a swap meet outside Texas Rangers stadium ball park. Not bad. Lots of brand X and a sprinkling of mopar junque. I got this industrial lamp shade for $10, that I will strip and restore. Going to make a mount and put it outside my shop building.

I know the bellhousing is a toploader truck V8 bellhousing, however one of the things I wanted to make was an engine run stand. This is perfect for that1. I lacked a starter mount, and this corrects that issue. Now I just need a flywheel.

Does anybody know for sure what size diameter and tooth count this bellhousing needs? Casting is PN 3893728. Rock auto has cast 143T flywheels for 78 small block V8 truck fairly cheap. Could it be the larger 143T flywheel? Both my 360 and the 318 are neutral balance so I will be getting one for a 318.

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