You can do it, you just have to have the engine at TDC. The crank notch must be at 0 and the cam marks must line up with the notches.
Here is where your CPS should be with the no.1 piston at TDC and the base ignition timing set to 10 degrees BTDC.
If you have the no.1 piston at TDC and you line the CPS up like this it should get you within 1 degree of what your ignition timing should be. Use a timing light to dial the timing in perfectly. Its really not hard, just takes some basic knowledge.