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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...