I have 99 Carbed HP500's in stock configuration (except for Gil exhaust) I'm wondering which model of Holley Carb I have as I'm going to have them rebuilt. I know the model number is probably on the carb somewhere, but instead of driving 20 miles to TNT to look I'm wondering if anyone is able to tell me from here to save time? If not where exactly do I look on the carb to find model number?

800's

ok but is there any way to know the model number that I need in order to get the rebuild kit from jeg's?

the model number I think is a 4150 but you need the list number , its on the front of the choke tower

Holley actually lists two different numbers for the carb on the HP 500. They are, 80466, and 9022. I have one of each.

800 cfm

Btw, the number is stamped on the air horn.

I believe they are 830 cfm, none the less they are 4150's in terms of rebuild gaskets/parts etc. Most any auto parts store should be able to get you all the parts. My .02, get the "blue" non-stick gasket sets, a little more but seal better and reuseable in case you need to pull bowls off for any reason.

The carb ID number is, as said here, on the choke horn.

The number is on the air horn and go with the nitril gaskets. They are the best. Better than the blue ones.

They are 800 cfm.

Check this site out.
http://www.mortec.com/carbs.htm

Air horn, choke horn same diff. The part the carb gurus machine off to make the thing work better.