Try to install a six-pack manifold for a 440 rb engine (factory never did a 383 b engine six-pack ) did they ? There would be a slight intake port mismatch without spacers at the least as well as other problems.
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The owner is the same guy that had that '70 300-H coupe on the show. Claims it is a factory 383+6 with factory air conditioning!!! He bought the car new, and I noticed they were pretty intent on NOT showing the fender tag through all that. Nice car, very nice indeed! But, he claims that "Plymouth" called him nearly a year after getting the car and demanding to buy this alleged "prototype" back. I cal total BS on that! It's a 383 Golden Commando with a 4-bbl originally, of course. You can see the crude cut along the front of the air cleaner baseplate to clear the A/C compressor. But, trying to say it's a
prototype, when no 383+6 was ever built factory, makes no sense. A "prototype" if it were a '69? I could see. One built into the second year of a three-year style cycle, and knowing the 383 had but one more model year left before being replaced by the 400...hell, no! Such a ridiculous story about the car's history!
It was a rat's nest of wiring hell under the hood and dash. Little of that worked, and the owner had a couple of small fires, as a result. Ran only on the center carb, and had a few other problems, too.
A 383+6 intake was available through Direct Connection for several years, and then, Edelbrock marketed the same intake for a time. So, yes, you
can have a 383+6 (or a 400 or a 361) built with Chrysler parts...just not as a factory unit available on an assembly-line built car!