SUMMIT has just recently reintroduced a carburetor that was origionally designed by HOLLEY-
... after the AUTOLITE 4100 and was deleted some time ago (The AUTOLITE 4100 was designed by HOLLEY for FOMOCO for the 1957 production run). Here is a TECH ARTICLE- http://www.fordmuscle.com/forums/induct ... -test.html

The carb features all of the positives of the 4100 along with the easy tuning features of the HOLLEY 4150/4160.