The above distributor looks like a quality item. If someone buys one of these please share the important dimensions and photos would be very helpful.  I'm betting the trigger device is a Pertronix?

64F100 57FAIRLANE500

I guess including their WEBSITE would help - https://4secondsflat.com/Y-Block%20Distributors.html

They say assembled with PERTRONIX IGN III.

The way I read it, it says billet distributor. Why need a core?

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Thanks for the link - My guess as to why they need your core is to have an exact specimen for the new distributor they will set-up for that customer. For example, should it be for a Lincoln Y-block, the new distributor would therefore have a 15 tooth gear. Kind of removes a lot of what ifs and guess work out of the new distributor build so hopefully no repeat of what Martyk98 went through.  As they stated: No one size fits all sold here. This seems like an end-all for replacing the Y-block dual advance distributor. It's even close to stock in appearance. Also, for those folks running a mechanical tach, some time ago Ted checked out a tach drive replacement with good results.

64F100 57FAIRLANE500

"My guess as to why they need your core is to have an exact specimen for the new distributor they will set-up for that customer."

...hmmph ...

I wonder if  the reason might be their using the FYB DUAL ADVANCE shaft and gear for the SBF changeover (if all are actually SBF changeovers)? And also using whatever period core for some internals? Be quite a waste of cores.

Oh well, the OP posted he had a lot of trouble a few years ago. Maybe they have it worked out now.

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