harmonic balancer with timing marks?

I just got my 383 running in my dart. The engine is a mild high perfomance build with stock bottom end and 10.5:1 pistons and eddy heads. the short block was balanced and blue printed. My question is this. I have a BHJ SFi approved harmonic balancer on the engine but the timing marks dont go up high enough to set my timing at full advance. I cant keep a timing tape on it. they fly off. Can i buy another balancer and install it or will that throw off my crank balance?