wasn't there a problem with Eddlebrock producing enough to cover ma mopars needs for the 69 1/2 ? but that early cast date makes you have to figure mopar made the prototype in cast iron and before Eddy did their intakes???? interesting!!
We were thinking along the same lines. I'd thought I'd be able to find out more info online with a Google search but didn't come up with anything. I did find another intake that had been advertised on eBay a while back that the seller touted as 'super rare' because of the casting date but he didn't seem to know for sure the background on it. Every article I read only mentions aluminum intakes made by Edelbrock being used for 1969.