I like both of your bikes.
When I hunted for a small 4 someone called me and said they had a free
197x cb350F. So I jumped, drove 2 hours and got there to find
a frame, tires and that's about it. Well, at least it was free.
I would buy a 350/400 four if it was sold in the US and came with
four into four pipes.
peace,
michel