Help Please- Can Anyone Identify this distributor base?

Looking for an ID on this distributor base. Here is a picture and some specs.The top shoulder measures 1.990" The two areas where it goes into the block are 1.764" the gear is about 1.750" OD and has 19T From the base of the shoulder to top of gear is 4.020".

Not Cad, early Olds, SBC, BBC, flathead, SBF. What is it?

 

Bump for the evening guys. Any ideas????

 

I don't have any Packard distributers not currently in a Packard. However the hole in the block is 1.750. Don't look good. All Packard V8s I have seen are the same except for cylinder bore and slight changes to 374 heads.