Panic brings up an excellent point regarding fuel distribution. Too often intake manifold design doesn't give enough consideration to fuel distribution, it just connects the carb to the engine. Will it work? Sure, but when I see exhaust temperature variations of 250-300 degrees during dyno testing it tells me the manifold is questionable. I've seen the front 4 cylinders of an engine run 100 degrees hotter than the rear 4 cylinders, the center 4 cylinders run colder than the corner cylinders on a V8, etc. That tells me the intake manifold isn't doing everything it should.
Sometimes a carb spacer will change things but that is just a band-aid fix. One of the best manifolds...as far as fuel distribution is concerned, was a sheet-metal tunnel ram built in our shop for a BB Chrysler. Was it perfect? Far from it, but the exhaust temps were within 100 degrees and the engine made 1032 HP.
Ron
