Okay, since I am completely sold on the Holley / Weber 5200 carb, I have to weigh in here. I currently use a carb and adapter I bought from Langdon's Stovebolt in my 250 inline. (This engine has 323K on it.) I did not notice much improvement with performance or mileage, but this engine is WORN OUT. What I did notice is that cold starts, operating at low speeds, all around drivability, taking off from a stoplight; it all got better by a whole bunch. In cold weather it starts with the bump of a key like a chevy ought to, and you can drive off as soon as the oil pressure comes up ( about 30 seconds.) The water heated choke is absolutely awesome. So anyway, I am going to rebuild this old war horse next month using a bit lumpier cam, and a little work on the ports, et. I'm not going to try to turn a 4000 pound truck into a hot rod. I just want to put a bit more scoot in the giddy-up. When I do the rebuild I am going to work on both manifolds. I am going to split the exhaust, and open up the top of the intake to set up a better mount for the carb, and eliminate the adapter. I am convinced that for a mildly built or stock 235 or 250 the Holley/Weber 5200 is a VERY good choice. I'll keep ya posted.
Boo Radley
