Mike, thanks for kind words.
To be honest, we don't sell enough kits newer than 1970 for the 1971-1974 to be profitable. We did extend to 1974 on most brands for two reasons: (1) the last real GTO; and (2) Stromberg (to which we purchased parts and restorations rights) end at 1974. Kits for Autolite carbs end about 1968. Too much variation of parts (smog emission), and too little demand.
We would be happy to extend BEYOND 1974 on specific kits if we had a sufficiently large order to do the research, and produce the tooling (we do already on a few industrial kits). Sadly, I don't believe there is sufficient demand for the post 1974 Q-Jets, but would be delighted to be proved incorrect.
Remember that the commercial (parts house) kits are discontinued if they don't sell 1000/year of a given kit and these kits are MUCH more universal than ours (not as many individual parts).
Jon.
Good carburetion is fuelish hot air.
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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