I don't have a rotary in my 914 just yet.I built "the engine I've always dreamed of" for my RX-7.
Plan to install it within the next 2 months or so.
The old engine will come out, I'll rebuild it and put it in the 914.
It's not going to happen very soon, maybe in a year since other "audio" projects will come first.
The 914's engine is in very good shape at this point