Try dropping down your Total Timing a little. Might want to Lock Out your Distributor too. Carb./Camshaft seems a little small. On my 427 Windsor for comparison =Hope this helps!
- Total Timing = 28* Locked Out
- Pro Systems Carb. = 840 cfm
- Soilid Roller Cam Specs. = 252/257 Dur. .683/.685 Lift, and 112 Lobe Separation
- Rocker Arm Ratio = 1.7s
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