Need Help Identifying My Holley Carb

I just bought a 74 Nova. It has a Holley Carb. but the owner has no clue what size it is. I went to Mor-Tec.com but they didnt have the numbers for my carb. I have used Mor-Tec to identify my dads holley carb. But I cant find my casting numbers. If you guys could please help me here are the casting numbers 6210-3.. Can you please get me the information on this carb. Thank you in advance.

 

There should be a list number on the choke air horn.

 

It's a 650cfm Spreadbore Q-Jet replacement carb.

 

check out http://holley.com/data/TechService/Technical/Carb Numerical Listing.pdf it should tell you what you need to know..

 

Thanks.