James,

Because the crankshaft rotates twice for one rotation of the cam shaft, you can be TDC at the beginning of the power stroke or TDC at the beginning of the intake stroke when the timing mark it at TDC.

So it sounds like you were at TDC of the beginning of the intake stroke or 360* (crankshaft) off for timing the IP. When both cam lobes are up you are at beginning of the power stroke.

Never turn the engine backward.

P E H