Common refurb 91/30's typically aren't collectible. Typically. However, there are some odd-ball 91/30's among the refurbs that are proving collectible. There are some re-capture [SA] Finn-marked 91/30's (a couple have turned up), MO double/triple dated rifles, former sniper rifles, DDR /1\ marked rifles, etc. Odds are that yours has none of these features.
However, when I hear someone suggesting that any rifle be modified, I just want to say take a second and check to see if it may be better off left alone, or parts salvaged that may be useful to others who need them. I'm a collector and shooter, and it's your rifle and you can do as you please. I just hate to see what once was a cool rifle worth less than 1/4 of it's likely value because of modifications. For example, Mosin Dragoon rifles and M91 long rifles were once very cheap and not considered collectible. Many had barrels cut short and stocks cut. Some of these were rather rare now and could be worth much more in original condition. I'm not suggesting your 91/30 is a rare gem or will ever be worth much more than now, but sometimes you never know.
I still suggest selling the stock to help pay for a custom sporter stock, which may make the rifle a better shooter. Good luck with your project.