If you take advantage of the timing control, low vacuum becomes "almost" completely inconsequential. I had to deal with no timing control when I first started with the early FAST EZEFI. That was more challenging. Now, having individual cylinder control, and timing of the injection event, it's a cake walk. You can even get rid of "some" of the exhaust smell associated with higher overlap camshafts.
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'65 Tempest 467 3650# 11.30@120.31
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