Yes, you can use those speakers in a HT system. Which speakers do you plan on using for the front left & right speakers?
Just one point, a center speaker is quite important, much more so than the rear channel speakers. It should excel at reproducing voices clearly, as most center channel content in movies/TV is the dialog. And if possible, it should blend well with the other two front speakers. I'm not sure how you can find something to blend with those Japanese speakers. Did you get them in the 1970s?