The one exception of the Edmunds manifolds is the Edmunds Racing 2x2 Intake the carbs are spacer directly over the intake runners. This does present a problem with the generator. you would need an offset mount, as the front carb being directly over the ports does not leave any room. I have one of these manifolds. I have had it over 20 years, I was always going to put it on my 51 merc, which is all stock, survivor car with only 88K actual miles on it. I have not been able to bring myself to put it on, because the car runs so darn well the way it is. if it ain't broke don't fix it. I have posted a picture of this manifold before, but I have lost all my photos when my other lap top took a crap last spring. I know " tubman" was in on the discussion of this manifold, maybe he still has a picture of it. I would not say that it is rare, but I have only ever seen 2 others for sale in 20 years, and have never seen another in person. I wish some one had done some flow work on one of these as I always wondered how much better it was.---Jim