Howdy again,
Here's a link to a page with info about joining the club:
http://vcca.org/application_to_join.htm When you get your VCCA number, put it in your profile and then the VCCA magic elves will grant you access to the members-only part of the site.
Regarding the question about whether your engine should have a '27 or a '28 carb, that depends on information that you'll learn from your research. Answers to questions like, what is your vision for your car, how authentic do you want it, what are the differences between the two carbs, do you want a driver or a show vehicle, some of both, etcetera.
Opinions are like belly buttons, everybody's got one and there are a lot of differences. Ultimatly the bottom line is what is important to you. As you learn more about Chevys of the era and your car in particular, you'll figure this out.
Enjoy the journey! It is a wonderful, winding road.
Cheers, Dean