My 69 RAIII std bore 400, 50K orig miles.
Was running a bit hot, a water pump rebuild and set the "Plate" to 0.050", gap, helped a little.
Month later rebuilt Rad from a 3 core to 4 core.
Now it Runs almost too cool now.
Always been satisfied with New triple gauges set, they are More concise readout to monitor things.
At the time was new to Rochester carburetors so I followed a Qualdrajet bible- PDF , set up the jets/rods for "total area" to near recommended 0.003xxxxx,.
I never had any carb perform like it dd once I was done tuning setup it as per the manual!!
Very impressive performance.
See the link for resource.
http://corvette-restoration.com/wp-c...arb_Tuning.pdf