Royce,
Mine was about $700 with shipping and all, I hadn't seen anyone else post the cost of theres. High yes, but a locally built carb was priced at $650, and even had local people say "ProSystems are the best, but expensive"
They build them to your specification based on your engine combination, I think the starting price is $590 and goes up, give Patrick a call, he'll fix you up.
Being they are built to spec, you put it own fire it up and you're done, all I had to do was adjust the idle.