A generic dual four barrel is the easy way out on a 4-71. You don't want that!

The Hamilton 471-2x2 adapter plate makes it possible to easily run a desirable 2x2 carburetion setup on your 4-71. The 471-2x2 adapter is constructed of cast aluminum and precision machined to fit your GMC-style blower. These are designed to look as though they are vintage speed parts. The adapter will fit Holley 94, Stromberg 97 and other 3 bolt carburetors.

Adapters are sold with the as-cast finish and include the required four 3/8-16 1" bolt hardware needed to attach the adapter to the blower.