HELP - 460 running way too rich

Help! I cannot get my 76 to lean out. here is what i have done:

Timing - ok
Carb - Holley 600 cfm - put in smaller jet, adjusted floats, turned OUT idle mixture screws.
New Spark Plugs - Gapped .042
RPM set to 650

Engine has 16mm vacuum at idle, needle is steady. Runs great except for the rich condition - something like 1538 HC during inspection.

Any ideas??? Help! email me off board if you can - i need help asap.

TY

Paul
[email protected]

Sounds like you are having calibration troubles.

If you are higher than sea level at all, the 600 Edelbrock comes setup for sea level engines, which is why it will be rich out of the box. Get the calibration kit that comes with all the rods and jets, step-down springs.
Follow instructions with the carb, or if you don't have, go to the Edelbrock site and find it there.
I had to go three stages lean on my cruise mode, and one stage lean on the power mode for my 460, at about 3100 ft altitude. With a little patience and a clear understanding of the instructions, you will do fine.
Mark