There are several reasons to increase the air flow of the intake system:
(1) If the original carburetor were too small (well, marginally in the case of the 235)
(2) If the engine displacement is increased (not true on a stock engine)
(3) If the engine RPM limit is increased (not true on a stock engine)
(4) If the engine volumetric efficiency is increased (multiple carburetors MAY increase VE, otherwise not true on a stock engine)
The above being said, the 235 is a perfect engine for THREE carbs running simultaneously, BUT ONLY IF THE PROPER SIZE CARB IS USED! Three carbs running progressive linkage will probably run worse than a good running single original.
Why is the 235 perfect for three carbs? Because the cylinder head is designed for three intake ports. Run 3 smaller carbs, each approximately 1/2 the flow of the original, and each centered on an intake port. The symetry of the system WILL somewhat increase the volumetric efficiency of the engine.
Power gains of 5~8 percent on a stock engine (maybe 12~15 percent if headers are added at the same time) is possible IF YOU DO A PERFECT JOB OF SELECTING THE CARBS AND SYNCHRONIZING THEM. Proportionate fuel economy gains (depending on one's driving habits) will also occur.
Is is worth the cost? Each individual must answer that question; but from a purely financial standpoint, the answer is no.
Again, three single barrels running progressive linkage on a stock engine will run worse than a good single original.
Jon.
