Maybe it's wishful thinking, but I don't think Quad 57's or KEF 107's would be out of place in those rooms. Haven't owned much other "top shelf" gear from that era, just these two speakers, but I find them very good. Certainly they were in the same class (or better) than the KEF LS50's I had.
My limited ears on would agree.....no disguising quality from the more modern vintage engineering done well. (My vintage KEF 104/2s step into that arena truly decently......would love to hear 107s.)