A foolproof easy way to find top dead center #1 compression stroke is to remove the left valve cover and watch the #6 cylinder (assuming standard 289 firing order) valve action as you rotate the engine. As the exhaust valve is closing and the intake starts to open there is a point when they are exactly level with each other (easily eyeballed) and at that precise point #1 will be at tdc compression stroke. It is a great way to set as it works on any engine as long as you know the firing order, you always check on the cylinder that is opposite of number one in the firing order so in this case the firing order is one542, six378 if that makes sense.
Use this method and you can verify your cam timing without pulling the timing cover as your tdc mark on the damper will be on the mark when the valves are at the even stage. You can rotate the engine back and forth a hair when you get close and get the passing exact. Try it, it works flawlessly!