You will want to do this with the cam cover off.
Put the engine at TDC as indicated on the crank. Look at the cam lobes on the #1 piston. If they are pointing more away from the piston you are at TDC on #1 cylinder and the cam marks should be lined up along with the balancer mark. At this same time the #5 piston is at TDC BUT not on the compression stroke. Now turn it over until the crank balancer mark is lined up and look at your cam lobes. The #5 piston cam lobes should be pointing AWAY from the piston like the ones on #1 were previously. This is TDC compression on #5. Your cam marks should not be lined up at this time. The fact that you can turn the engine over is an indication to me that you are probably in pretty good shape.

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Jim