Cam install question - HELP!

DONT use lapping compund or any abrasive. The bearing is designed to imbed material a small amount of material like that. A lot of it will ruin the bearing, and possibly the cam. Addditionally, the feeds to the rockers will get the abrasive into them and it can't be removed completly without removing the cam bearings. You dont want abrasive material of any kind near those bearings. That would be why cam bearing scrapers have been in use since gasoline engines had metal cam bearings.