Or maybe, seeing that it was found in Detroit, it was a top secret Ford experimental manifold that didn't make it.The intake is identical to a Weiand
It's straight and not abused if I were to sell it what do you think it's worth? with no name or origin...Is it something you would use or just a wall hanger?
No mystery, all the current manifolds have the same pattern that requires an available adapter plate to mount the Edelbrock 1403 etc.to add to the mystery the carb mounting is 3 3/4 x 3 7/8 seems odd to me see pic. my Edelbrock is 4 x 4 I believe.
A friend had one on 53 Merc in a 41 that looked like that. Said it had a Oldsmobile carb and would guess that would be similar to the Buick. He also had Mallory dual point dist.The early 52/54 Buick Carter worked great, with no mods.