Aloha Desert,
Welcome aboard!! This is a great place to ask such questions. While very
cheap, a Snark might not last too many seasons. If you can find a
cheap Sunfish ($350) it might be a better value in the long run. Many
parts are available through eBay.
The question about height is not near so important as weight and agility. If you are young and bendable then you can sail even smaller boats effectively. While younger I had a great deal of fun sailing an 8' Sabot and I'm 6' 2" and weighed in then at about 175.
Kind Regards,
JohnL