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Danielg correct. When I tossed my 850 Holley for a 650 Demon 5 years ago it required 19 degrees initial advance and I set my motor at 32 total advance by 2200 rpm. If you set up the idle mix screws correctly and check to make sure the throttle blades are positioned correctly to the transition slots, your half way home. Rich mixture is caused by both the main jets as well as the idle circuit. You really need to spend time on the dyno with a sniffer up your exhaust to dial in a good A/F ratio at light throttle cruise and under full throttle. 14.5-15:1 is good for light throttle cruise at around 2500 rpm. 12.5-13:1 for high speed.

You may still get that big old carb to work on your 460 and I guess it is probably an 850. A lot of CFM unless your turning at least 6500 rpm for peak HP.

When I tossed my Holley I absolutely could not shake the light stumble at throttle tip in. Following a set of exact Demon carb set up instructions my 418W has been happy ever since, as well as the driver.

Bill