How do I adjust my timeing when the balancer has no markings??

Reminds me of some GM's (where you set it at 0*). Absent ideas from others, I'd set it to TDC (get it right-on - use a dial indicator) and lay down some timing tape.

Good luck.
 
Get a timing light with the dial on the back. All you do is turn the dial until until it reads the timing you want and then turn the distributor until the notch is aligned with the pointer.