Technical SBF 160 tooth flexplate?

This unit is stamped C4AE-6375-B
I have counted the teeth multiple times and it is in fact a 160 tooth flexplate.
I cannot find a replacement for it. Just the 157 and 164 tooth units.
Any idea where to go from here? Can I interchange the 157 and will the starter work?
Thanks in advance for your input.

Motor and trans came out of a '69 Cougar.

 

The 160T was an early design, it was changed to 157. The 157 will fit....