Xero,
The search engine is your friend! All your questions have been asked and answered umpteen times. The Norinco M14S is a better rifle than the Springfield Armory M1A. The Norinco has a forged receiver that is within mil-spec, while the SA is a cast receiver that is often out of spec. The Norinco, 9 times out of 10, will match or beat an out of box SA shooting the same ammo.
Since you aren't grandfathered to own an actual M14, you'll never own a functioning example unless our gun laws are miraculously rolled back a couple of decades.
If you want to scope it, the best mount is the Smith Enterprises picatinny rail. The second best is the ARMS #18. The Smith is uber expensive in Canada right now due to high demand in the US and difficulty in exporting from there. The ARMS mounts are a little less expensive and if you watch the EE closely, you can luck into a deal now and again in the $180-$200 range.
USGI fiberglass stocks have also become insanely expensive in Canada, again due to supply and demand. They're now regularly listed in the EE for $150-$240! A couple of years ago I bought them for $40-$50 each in the US. Your other option is to purchase a new laminate or walnut stock from Boyds. With shipping, those will run you around $130.00 give or take.
Once you add a stainless spring guide rod and swap out the Chinese springs, etc...for USGI, you'll be left with a heavy, robust rifle that will certainly be capable of taking most big game in North America. However, the rifle you already own can already do that job, only better!
. It looks something like this:
