Triple side draft 51 ponty

Hey, looking for a triple or twin side draft manifold setup for my straight eight 51 pontiac, have search ebay, as one does but to no avail, my knowledge of staight eights and speed equipment if any where made is none.
I know what ever i do she will always be a slug but what the hey, just a temp measure untill i find a olds motor for her.
Any help would be apperciated

 

I'm not sure thats going to be easy to find.You could modify a stock manifold to do what you want.Although this is chevy and they aren't side drafts the same thing could be done for side drafts.You can see the flange that was added in center,the outer carbs are done the same.this could be done for sidedrafts.

 

Try looking at a 41 Buick straight 8 it had dual carbs and might be adaptable to the Pontiac.