Oiling problem. HELP!!!

I have an engine going together in the garage. The plug above the rear main cap can be measured from the top of the block. Use a long (at least 10') small rod and place it in the hole on the rear of the block next to the disty hole. This hole is for your oil pressure gauge or sender. Mine dropped in 7.7" until it hit the plug. Someone on here said 7.5". Its an easy way to check without pulling the pan.