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That looks like a Cirello “Frankenstein” magneto, but the tag looks different, Cirello used an oval shaped tag. What does it say on the tag? The drive is for an early hemi.

 

I have no knowledge of your magneto but I suspect Cirello and the E.M. Company may have been taking a commercially available mag, adding the necessary
drive and converting them to high performance use.

 

OK, I did a little digging and I found out that E.M. Co. was operated by Tony Cirello, he ran Engineering Modification Company and that was an aircraft overhaul business. He built the first Frankenstein mag for drag racing in 1964 continuing until 1967, building about 300 mags. Later his son started Cirello Magneto continuing to build and service magneto’s. He produced around 400 Frankenstein’s under the Cirello name.
It sounds like you have an early Frankenstein built by Tony.

 

There were only 700 or so of that model produced and you want to find someone that’s restoring, or building a tribute car of a drag car that ran one. I have no doubt it would bring $1000 and that may be conservative.