"...this is my first rifle...got 8 enblocs..." Nice way to start. You need 2 more to fill an ammo belt. And a bayonet.
"...a run through the dishwasher..." Don't. It'll raise any cartouches there are. Steam any dents out.
"...high gloss finish..." This'd be the one time you hope for polyurethane. It'll come off without too much fuss. Alcohol eats it. Tung oil will not come out. Looks like a birch/beech stock with a walnut rear hand guard. Cost you less to buy one, if you can find a birch/beech guard.
You can stain birch/beech to try and get the stock close to the hand guard. Tung oil will not darken it. The stain must go on before the first coat of pure tung oil(NOT Minwax Tung Oil Finish. Isn't the same thing) too. You can't bleach walnut enough to come even close to birch/beech.
"...does not have any manufacture dates..." Not unusual. Likely a post war rebuild. Those stocks didn't always have cartouches etc.
"...16 rounds of handloads..." Pull 'em.
Buy a copy of Hatcher's Book of the Garand. History and a trouble shooting chapter.
Surplus Rifles M1 Rifle pages are pretty good too.
http://www.surplusrifle.com/index.asp
Free .pdf's of the U.S. Army TM and FM manuals are here. Note the need for the provided UN & PW.
http://www.biggerhammer.net/manuals/
When you get that far, think 150 or 165 grain hunting bullets and/or 150, 155, 168 or 175 grain match bullets with IMR4064, IMR4895, H4895 or Varget with regular primers. You must full length resize every time and watch the case lengths too.