Do you have a 1406 now? If you do, buy a rebuild kit for $35 and do it yourself. Print out the tech sheet from the edelbrock website:
http://www.edelbrock.com/automotive/eps_intro.html and rebuild it yourself. It is very easy to do. The tech sheet will tell you how to tune the carb and give you better pictures to go by when you rebuild the carb. Good Luck!
Sonny