Dual carbs will provide about a 10 hp increase mostly in the top of the RPM range. They help the 235 breathe a little better, which it sorely needs.
As much as I like the single 4-barrel, it's pretty boring as far as the "Open hood impact" factor. Speaking of side-draft carbs - I've located an old McGurk triple side-draft intake for my GMC. The owner was not anxious to sell it, but admits it's likely to just gather another 40 years of dust. The S&S Harley carbs seem to be able to flow enough for a 100" V-twin, so thats going to be my winter project...like I needed another one.
