I live a bit south of Tucson....down in the land of no smog testing.

Years ago I did a bit of normal maintenance work on a customers 55 300 but never had a chance to do any "playing" with the carbs or intake.

I did have a factory 1958 BB Dual Quad intake on a 69 440 I stuffed in a 57 Dodge Coronet many years ago. The design of the manifolds is pretty much identical........ BIG open plenum with a couple of 4 BBLs bolted to it and a large heat chamber cast into the bottom. My experience with that intake was that performance was noticeably better with a 1:1 ratio but mileage suffered by a couple miles to the gallon. I suspect my experience will be pretty much the same with this. I also recall that with that intake the engine was pretty cold blooded too, hopefully the MSD I'm running on the 57 will make a difference with that.

I used to do the swap meets a lot in the pre-internet days and it was very seldom that you saw ANY early Hemi parts. I only do about 1 meet a year now but it's still pretty much the same. I did score the Weiand Drag Star 6X2 intake that's on the 331 in my 37 Dodge at the Prescott Swap meet 25 years ago though. Seems most of the HEMI stuff usually gets shuffled around by word of mouth.