Personally, I would be going with the original Rochester, simply because it was calibrated for the engine, and has the correct lever for the throttle actuation.
You don't say what model of Holley is on the engine, which could have an effect on performance, as there are so many different Holley configurations.
If it is one with the Vacuum Secondary, then that one would be best for street use with an automatic, but then again, the size and jetting could be way off for a 429 cube engine. Most Holleys sold in Australia are for smaller engines like the 350 Chev and 351 Ford.
Bruce.
