Looking at Ebay I see factory dual point distributors for sale.
One said it was a factory 57 Corvette.
Another ad said it was a factory 56 six cylinder.
In the 70's I had a Mallory dual point but never gave it much thought.
Were these an option in 55-57 or standard on some engines?
I don't remember any discussion about these. Probably because we all have HEI's