I have an idea, put a NASCAR restrictor plate under the carb. 
Kidding!
Kidding!
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2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning
1995 Z28, many mods, SOLD
A proud member of the "F-Body Dirty Dozen" -
This thread brings back memories of the endless persuit of the perfect tune. One of my most favorite motors was a 283 with a steel crank, pistons, etc, Z28 intake and a holley 650 vac secondary. The way it would wind out, I didn't miss a DP. Besides, it gave me better mileage too. Ironically, the street setup I had on my Pro-Street/Strip car used two 600 vacuum secondaries on a offenhauser low rise twin four barrel manifold, 468 cube big block chevy. The street manners were for the day, awesome. It actually rivaled modern fuel injection when it was within a certain temperature range, 
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Me too. I spent endless hours fine tuning my 85 Mustang GT. It had the factory Holley 600 carb on it. I bought the secondaries spring kit and the accelerator cam kit for it. I finally ended up putting a screw in the slot on the secondaries throttle shaft about half way through the curve. At half throttle, it would force the secondaries to start opening. That fixed it. It was perrrrfect after that. I bet I rebuilt that thing at least 5 times trying to get it right. I did it once with my eyes closed just to do it.2002 Electron Blue Vette, 1SC, FE3/Z51, G92 3.15 gears, 308.9 RWHP 321.7 RWTQ (before any mods), SLP headers, Z06 exhaust, MSD Ignition Wires, AC Delco Iridium Spark Plugs, 160 t-stat, lots of ECM tuning
1995 Z28, many mods, SOLD
A proud member of the "F-Body Dirty Dozen"Comment
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You should have seen the surgery that I did to an old quadrajet after a backfire through the intake under nitrous. It literally blew the secondaries into a horseshoe shape, melted the air horn, it was toasty. I tuned it into a perfectly functioning two barrel by using epoxy and old throttle blades. It gave me great mileage only having the two primaries. I would swap the carb with my holley for track duty and all was well. Actually put a few thousand street miles on that carb and ultimately had it on a car that I traded in. I would have loved to see the look on some tech's face when he discovered why the secondaries wouldn't open. 
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