Please listen to what Jerry and the other Jon have told you about that manifold and the 235. When I was in high school and college (very long time ago), this was supposed to be the ultimate "fix" for the 235...something you could bolt on and make it run just like a V8. And 4bbl manifolds were everywhere. J.C. Whitney sold them and they were also advertised in every hot rod magazine. What almost always happened was this: the person put on the manifold and whatever 4bbl they could find that would fit. The 235 now ran worse than ever and no amount of adjusting helped. But for some odd reason they would not abandon the scheme. Two...some mechanic boasting of "knowing a lot about racing engines" would tell the person he needed different spark plugs, a dual point distributor and special spark plug wires. So out the window went more money, unwisely wasted. Three...when none of that worked, that same mechanic would later tell the person what he really needed was a different cam to make it run right. And surprisingly many followed this advice and now had wasted a bunch more $$ on a 235 that might have to be pushed or parked on a hill to get it started, would not idle at all, would not run worth a flip and drank gas like crazy. Am I saying no inline 6 worked with a 4bbl? No. Pontiac Division had an Overhead Cam 6 that ran great with one...but it was a very special 4bbl engineered specifically for that engine. It was John DeLorean's project. Try to find one of those carburetors today. If you do, you'll need a whole bunch of money and even then the 235 will never run like that Pontiac did. Good luck!
