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Larry, glad to see you stayed with us. I don't think it matters what oil you use, just make sure if the engine is a fresh rebuild (dry mains and cam train) you do as other have suggested and put oil down the distributor hole so the mains and valve train have oil before starting. If it were me I would put less expensive oil in for the first 3-5 hours of run time, then drain to flush out any residual dirt/grim that might have been left in there after the rebuild. Then fill with a better oil and run it longer.