The date code on my Boxcar 1850S is 453.
3-digit date code is
Year
Month (A=Nov B=Dec)
Week
So mine is 1964 May 3rd week
922 = 1959 Feb 2nd week
183 = 1961 Aug 3rd week
Looks like they made a lot of these Boxcar 1850s. No wonder if they all run like mine, fastest 600 Holley I have., in fact, the fastest 500-600cfm ANYTHING I have.
I do have a 352/360hp carb, have not run it yet at all let alone in a Shootout.
Need the right engine & the right time.
I have done lots of carb shootouts on the GTECH.
Most recent was on a 285hp 390, basically a bone stock 390/300 build.
Shakira, my best 735 Holley, won but barely
Snooky, my best 500cfm Autolite 1.12, was 2nd.
An un-named c4af-r 500 Autolite 1.12 came in a very slow 3rd until I swapped boosters, then a very close 3rd.
I didn't have time to run my Boxcar 1850 in that shootout but pretty sure it would have won.
The car sure didn't need that whole 735cfm, so the fact that the big Holley won tells me that the Autolite 4100, even my best one, is just maybe 1% shy of being the equal of a downleg Holley, but will not outrun it.
CFM for CFM, the Autolite 4100 will outrun the Carterbrock AFB, making about 3% more apparent power when run on the clock. My best Autolite 4100 will make about 1% more power, cfm for cfm, than my best Autolite 4300, but most Autolite 4300s are "just ok", like about the equal of a Carter AFB. However, I do find that carbs are all over the map. Drew probably knows why but sometimes I cant sort it out. Some are down as much as 10% on power (derived from the GTECH), and the 4100s show a particularly high spread. Even the Holleys can show maybe a 3% spread between a "just ok" Holley and my best ones.
When my carbs win a Shootout they get names, like Shakira, Freckman, Snooky, Tia, Tamera, Fiona, and Melinda or MEL for short (the 430 carb). The others run "Good" but not "great".
I wish there was an easier way to clean boosters. A curse upon whomever pushed putting water (ethanol) in our pump gas.