Advice on Edelbrock 1404 CARB @ 6700 FT Altitude

Most people are happy to talk with "live" tech support.
Did you read the carb manual? If you don't have it, here's the link:
http://www.edelbrock.com/automotive/misc/tech-center/dl/carb-owners-manual.pdf
Page 9, High Altitude. Read the manual, follow directions, should not be too complicated. These carbs are generally easy to tune.
Looks like the 1486 kit should have what you need.
Good luck.