I have tested them all on my 383's over the years. The M1 will work but can be very finicky with the tune-up. A torker or TM6 with a 1" spacer is just as good and much easier to tune. That said the M1 works better on 383 and 400's strokers that use the 3.75 crank.

33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

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