I'm thinking of the same upgrade on my '56. I'll probably buy the bracket from one of the specialty vendors but I'm sure I can get a better deal on the MC at my flaps.

Fla54Chevy3100s guess that a '70s truck MC would work is a good guess. But does anyone know for sure? I'm assuming since the stock one is 1⅛" bore, the replacement should be the same bore.

But the stock one pushed 4 slaves with the 1⅛" bore. The dual will be pushing 2 and 2. Does this mean it should be smaller bore?

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.