David my brother Geoffrey had a 411 mk 1 with the 383 motor which had been set up by a friend of ours in Sydney, Keith would know more about Chrysler cars and motors than any one in Australia .Geoff fitted an alloy manifold and had made a set of extractors . This car with a very mild sports cam would go like the wind and return 18 to 20 mpg.
I have spoken to Keith about my 411 and he has suggested reverting to a standard sports cam as supplied by Bristol and use either a 600 or 650 Edelbrock carbie. Edelbrock have a new range of carbies which are meant to improve economy and performance.
I had a hotter cam fitted to my car and wish I hadnt
Your car being a Mk3 had a slightly detuned motor than the Mk 1 and 2 but I have no idea what cam was used. Chrysler at the time were detuning their motors in the 70s and eventually upgraded them to the 400 motor which had low compression and no go. My 412 is very slow compared to the 411.
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