On the cam sprocket, one of the "spokes" has a raised bump and an "E" on it, that is the mark you use for cam timing. When that mark is up (at 12:00), then that indicates piston #4 (the one closest to the firewall) is at top dead center (TDC) on the compression stroke. The crank pulley mark should point at "0" on the timing belt cover. Then, if you rotate the crank 360*, so that the crank pulley mark lines up with "0" again, the raised bump and E on the cam should be at the 6:00 position.....that indicates that piston #1 (the one closest to the radiator) is at TDC on its compression stroke.
If you need to put the cam pulley back on the camshaft, then the pin slot that is opposite of the raised bump and E is the one you use to position the cam on the camshaft.
So now that you know how the engine timing is set, you should be able to get everything positioned correctly.