Pumpkin head- 2 oz of seed is pretty small qty of seed. Consider that there is approx 7000 seeds in a pound, so one ounce will likely have approx 440 seeds. You will get approx 880 seeds for your purchase and they are none to big.
While that sounds like a lot of seeds, consider that planting density of a given seed bed is pretty thick. Also, by the time you harvest your 4x30 bed, if you have 3 out if 10 seeds that have matured, you will be doing good!
Some folks plant real heavy, and two ounces of seed might go into one 4x 30 bed... Or less.
The viability of harvested root is a whole different question. If you do a search on this website... You will find a good discussion on this somewhere.
A word of instruction... Keep to a topic. If you have a different question, then post it in a new thread. There is a whole group of good guys and goals here, and most are happy to answer questions....