I have a 411 series 2 383 and a 412 series 1 400. The 411 had a 750 Holley and was giving 8 mpg on an interstate trip, I swapped it for a 650 edelbrock (carter) and immediately got 13.5mpg. Nothing I have done has improved that milage.
The 412 with the 400 motor has a carter I think 650 gets about 13 to 14 mpg for seriously less performance.
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