Holley Dominator Question

I am helping my Chevy friend with his camaro and have a Holley question. A little background, the car, a nine second camaro with a 434 small block was bought with a hurt engine. It had been running alcohol through a carb. The engine is getting rebuilt and dropping the compression a full point to 13:1 with new pistons. We plan to run race gas through a carb. This is all new ground for both of us as our previous cars and track time was all in the high 10 and 11 second range. The machine shop doing the engine work suggested a 1050 dominator.

These carbs are for sale locally, can anyone comment on them, what are used dominators worth, is there anything to look out for?

http://classifieds.castanet.net/details/holley_dom_4500_carbs/2197955/

Thanks guys!