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Appreciate the feedback. Even though your engine is a stronger set up than mine the 15 " is okay. I continually heard 20" was expected for sbc. I'm gonna mess with the idle mixture as you suggest. Thanks.

Good to hear 20" of vac isn't necessary. Thanks for your info. I'll try adjusting dist. for best vac rdg. It is at 12 now that gives the 14". We'll see.

Looking for advice on initial timing number. Newly rebuilt 400 sbc. Bottom end is stock. Aftermarket heads: iron, 72 cc, 210 cfm intake flow. Hydraulic flat tappet cam: 443 lift, 214 duration, 110 separation. Aluminum dual plane intake: 165 cc runner. Carb: 600 cfm dp. Stock hei distributor: 20...