CanadaPanda - thanks for posting this all in one spot as while all this info is posted here already ( much of it in the stickies ) having it condensed into one, easily understood, and short thread is very helpful for new users.
I am not an expert but I 've been around this platform a long time and I've a few observations:
1. before doing any accuracy mods read AS MUCH AS YOU CAN ABOUT THE M14
2. the number one thing to do for accuracy in the M14 is to figure out a good load
3. reloading for a M14 gas gun isn't hard BUT it takes different knowledge to that required for a bolt gun. Read before re-loading to avoid potentially unsafe things happening.
4. bedding a M14 is more difficult than a bolt gun - practice on a Norc stock before playing with your Boyds or USGI.
5. once bedded the rifle should not be frequently disassembled. Skim bedding may be need to be reapplied after about 1500 rounds - YMMV
6.
if you can, get to a Hungry (Tactical Teacher) clinic or similar. You will learn more in a day than you will over several months of playing on your own.
Re Op Rod guides, I personally like the Sadlak but you will need a USGI spring as the Norc spring wont fit.
Have fun with these rifles - they are great learning tools and fun to use. If budget is tight then keep it stock and save accuracy goals for your Rem 700 bolt gun - remember what USGI accuracy standards were for the M14 and then you can relax a bit

If budget is there then spend away on modding the heck out of the Norc or buy better but be warned the cost of going from 2.0 MOA to 1.0 MOA will shock you LOL.