Sounds like a post 64 model 70. I've picked up a few over the years at pawn shops and gun stores. I'm not sure if they ever used FN 98 receivers like the JC Higgins line. I've found a few of those too. Both are cheap rifles built on high quality receivers
I've built rifles on receivers from both. I have a Winchester/Sears mod 70, in 25-06,that I built for a guy that died and his family didn't want to finish paying for it. Even though I have little use for it, it shoots great I don't think I'll part with it.