2100 " 1968 289 (C8ZF-G) does have several engineering problems which we do correct (hesitation, flat spots and surging on acceleration)." This is the carb used on most Cal Specials, as far as my research could tell...
4100 "There are several subtle engineering changes that we do to this carburetor to make the secondaries perform even better "
4300 "From day-one they all had engineering problems. In driveability those problems amounted to hesitations and flat spots on light acceleration, a big bog on hard acceleration, and hard starting when hot."
4350 "The Motorcraft 4350 was first introduced in 1975 and was only used on the 460 V8 engines. It has some chronic design problems which we do correct"
4150 " Many of the Holley carburetors had engineering problems....In driveability these amount to hesitation and flat spots on acceleration and hard starting when hot. Problem carburetors include 1967 and 1968 390 GT" Driven my '68 390 since '91, never seen any of these issues with my Holley.
Carter "Carters are pretty good carburetors by design, but they do suffer from a weak accelerator pump design,"
Quadrajet "They all had hesitations and flat spot on acceleration, a big bog on hard acceleration and hard starting when hot." (I owned a 70 Cutlass for a decade with a QJ, never had any of the problems noted and never had to touch it)
So no carb manufacturers ever got it right! But Pony's bread and butter is convincing folks to "fix" carbs.
Have known a few folks who paid the $$$$$ Pony wants and were not satisfied, not much improvement from OEM, the reply "you messed it up, not us"...
But more to the point has anyone swapped from a Holley back to the 2100 and have a "real world" comparison?