Nice! Yeah, what RustyUs has been saying is 100% true. I'd use an 8.5 in that buggy if I were you for maximum fun and bashing enjoyment. For parts, get all the RPM for that vehicle you can find, especially the front arms. I also suggest Lunsford or upgraded AE turnbuckles and RPM ballcups, as the stock AE ones love to bend even trying to just pop off the ballcups. If you can't find the RPM front arms, just get a large bumper for it.
Turnbuckles;
http://www.ebay.com/itm/Associated-R...8AAOSw9r1WCeMj
Ballcups;
http://www.rpmrcproducts.com/shop/su...duty-rod-ends/
Bumper;
http://tboneracing.net/11015-tbr-rac...associated-b3/