Most of the major suppliers carry something. Charlie Yapp makes his own: http://www.secretsofspeed.com/PARTS-LIST.htm Dan Price may make something: (614) 891-2882 A better question might be, "Who makes the best?". Although not strictly according to the rules this might be a good question for fordbarn.com. Charlie Stephens
unless things changed a lot over there Fordbarn has a section for Hot Rod 4s and V8s. I came to HAMB from the hot rod section of Fordbarn