Does the vaporworx use a second input besides fuel pressure? Map or tps, or maybe rpm? I studied their stuff briefly, but don't remember now. My general take away is that returnless is the most difficult way to go for a retro fit. And though my most desirable way to go would be closed loop PWM returnless, I've avoided it because I can't find a way that seems like it would work well in my retrofit application. I hope the OP can get it sorted and report back what works.
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'65 Tempest 467 3650# 11.30@120.31
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