What carb does everyone run? I'm looking to run sprints and need to find a place to get a carb and rebuild kits for it.

i run this carb on my Gn WYK-194
http://www.quarterscalecar.com/shop/index.php?action=imageview&type=item&id=27

heres a site with rebuild kit info if you go with this carb http://www.partstree.com/parts/?lc=walbro&mn=Carburetor+WYK-194-1&dn=15WYKWYK1941

Do they sell complete carbs or do I need to look elsewhere? I checked the site out but don't see where they sell the whole carb.

try this link carb is $48
http://www.quarterscalecar.com/shop/index.php/action/item/id/27/prevaction/pricelist/

Yep, that link, and here is a webpage that has a bunch of 1/4 scale links for you.

http://glqsr.homestead.com/Links.html

There are parts and accessories for for most all the manufactures.

Do they have these carbs marked anywhere on the carb as to it's size? A friend of mine gave me a few, just wondering how to tell what size they are.

They are stamped on the side.