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I have a 750 Holley vac sec on my 1968 390fe Ford motor in my 1965 F-100 truck.
Motor just rebuilt w/550 miles. Comp Cam 495 lift w/Edelbrock alum heads. I have hesitation at first throttle response. After 2000rpm motor runs great and is very strong. Told it might be power valve. Disconnect vac line to vac advance dist and I have 15 vac. Have 6.5 power valve in Holley now what should I have??
Thanks
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