153 tooth or 168, How do you tell?

How do you know or how can you tell what size flexplate you have? I was told that mine is a 168 tooth flexplate aftermarket (better built) I thought it was from moroso but not positive.
I'm having some problems with my starter cranking over and it is the staggered mount 427 BB chevy. Any suggestions would be greatly appreciated!!!

Thanks, Raysir:(

count the teeth

Thanks Streets,
Now what about the other post I made, maybe you could shed some light on this also.