Finding a 4 BBL carb small enough to work on a 216 will be interesting. Even one of the tiny carbs used on the 56 Corvette 265 V8 dual 4 BBL setup would be too big for a 216, and they're so scarce and expensive it's ridiculous to even think about using that one. A 4 BBL on a 216 is a solution to a nonexistent problem, unless you plan to push the truck on and off the trailer at a car show and never run the engine.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!