I've been running dual stock Rochesters, sourced from NAPA, for six years with no problems, though I did have a mechanic with multi-carb experience set-up and balance them. Perhaps the two best things I did to the motor in addition to the dual carb set-up was the water-heating plate for the manifold and an HEI ignition, both from Langdon's. The engine starts and runs extremely well, has tons of power and with an easy foot gets 20mpg. Tom Langdon advised advancing the timing and running high-test as well as some really hot plugs. A pair of K&N air filters made a huge difference too.
