Hot Rods I.D. an intake manifold

I have a tri-power intake manifold with a casting # 3749948. Not sure what this is from.
possibly chevy? HELP?

 

yup, 58-59 348

 

348 /409

 

I'm with Squirrel...they never made a 3x2 on a 409,near as I know.

 

Yep 409 was 2x4 only from the factory.

 

when you have a GM part and need to ID it simply google the part number. it never fails