With the mix of parts it's not surprising that your pointer doesn't line up. First, be 100% sure of true TDC and the proper dampener, then you've got a couuple of choices. !) Modify the pointer mount to give more adjustment and line up with the existing notch on the dampener, or 2) Buy a Degree Tape from Summit, Jegs or another for your diameter of dampener, and install it accurately. Either should be golden.

Just curious, are you finding TDC with the head off, measuring direct to #1 piston with a dial indicator?