I found this item on e-bay. Its a very cool dual mikuni setup that bolts to a spread bore intake manifold. Not really RX-7 or rotary related, but cool none the less. Probably good for a bridgeport if you want to try to fit it with an adapter to a RB holley manifold.
http://cgi.ebay.ca/B-M-Mikuni-4-bbl-...QQcmdZViewItem

 

i myself would like to try one. but yeah, they pop up every now and then.

 

god that would look beautiful sitting in top of my B&m 144

 

It is a pretty cool part. Mabey not practical for an RX-7, but it would be nice on a V8 converted 7 (can't believe I just said that lol). At least the V8 would have something in common with old skool imports. But I could see that setup being a bit of a bitch to tune.

 

+2 tuning would be fun. lol