Well, I've started the process of converting my 250 6 cylinder to a 4 barrel manifold. The manifold is from Clifford that I purchased off Craigslist and had sandblasted. I then painted it with some heat resistant paint. The carb that I'm going to use is a Holley 600 CFM that I modified as Tom at 12bolt.com suggested. He blocks off one of the primaries which he says makes it a 450 CFM, which is a better size for the engine. Check out the video on his website or youtube for what he suggests. One picture is of the original manifold and the other is of the 4 barrel test fitted. I hope to make some progress on the conversion this Saturday, if the weather permits.
