I removed the through bolt on passenger side and tried jacking up the engine.......seemed to bind up and wanted to lift the entire vehicle. I then removed the driver side through bolt and the jacking maneuver worked successfully. Only had to raise the motor an inch or so, like suggested. I think that my problem with the binding at first was due to the fact that I was jacking from the front of the oil pan. After removing the second through bolt, I moved the jack to the rear of the oil pan and the motor came right up. I do believe that the valve covers can be removed with the intake in place, but it is so much easier with the intake removed and all of the harnesses disconnected and laying in the valley of the block. Thank you very much for all of your input.