I have 1976 38' with the Cummins V555 with a Allison 640 tranny updated to 643. This one is a bit slow off the line, but it goes 75mph all day long and at 10mpg on flat Eastern States roads. Try to get as much of the manuals and receipts as possible when you buy, the stack should be around 6 inches high!
Good luck to you in finding your Newell.
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