Bought these the other day, They are made by Cragar, They look a lot like the offy 5497 X rams but they are a lot lower and in height and both ends have been modified, One end is to large for a carburetor while the other end was modified to take a carburetor. Any ideas?
They were made to fit the GMC 3-71 blower and as @Crazy Steve said it was for hood clearance. Only one would go on the 3-71, they will not fit any other blower AFAIK.
Don Gallant, of Don's Speed Shop in Newington, Connecticut ran that set-up on his 1955 Chevrolet 2 door sedan.
Mox Miller had 2 of them ( bought brand new in 1958 and welded together ) on his 1958 Impala that never ran...