I have yet to shoot my 350 rm, (Ruger m77), but on paper, it's essentially a 35 whelen, which is a cartridge I love......
Be prepared to scrounge for brass and dies as they are a rare...
I used to own 700's and they are good rifles...... and the classics were the best IMOP....... I had a couple and enjoyed owning them....
It's really up to you if you wish to sell.... life takes all kinds......
If you like the 700 platform and take pride and enjoy (like me), having something a bit different that you don't mind working to feed, then you have a definite keeper there.....
If you want something more vanilla, then put it up for sale and do something for yourself with the funds..... the buyer will love his new gun and you get a chance at something you want...... pretty much win win in my books....