i've been doing a little reasearch on modifying the 4100 myself for a couple years now and have found an old 70's drag racing magazine that has an article on super tuning the 4100 and recommends replacing the stock needle and seat assemblies with those from a carter (afb i think), holley secondary spring kit, holley power valves (i may try some QFT 4 window valves), holley (or ford) jets and playing with the accellerator pump arm settings, plus a few other minor things i can't think of off the top of my head. the article claims as much as a full second or more in 1/4 mile times plus a few MPH if properly done.
also Summit has now come with their own version of the old holley 4010 and has made some improvements such as tunable venturi clusters, which i understand are interchageable with the 4100, and i plan on eventually ordering a pair of boosters and the idle and high speed restrictor bleed kits to do some experimenting with a 1.119 4100 i have and see what kind of gains i can get from it but more importantly i plan to optimize the 1.19 to my 351w which will have a mild hydraulic roller cam, aluminum GT-40 heads, nice flowing exhaust with either heavily massaged and ported stock manifolds or shorty headers and mandrel bent 2.25" exhaust, i may go up to to 2.5" but i prefer the 2.25" because it's much quieter and this will be in my mild sleeper 69 cougar so i want the exhaust quiet enough to not give anything away or annoy the piss outta me on the freeway.
as of yet i haven't put any of these mods into effect but i wanted to put this out there and get some opinions from the experts.
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HAVE A NICE DAY!!!!