Is there a place where I can get a bolt on timing cover gauge?

I am completely rebuilding a 350 TBI Engine bored .030 over out of a 1989 Chevrolet Silverado 4x4, I am replacing the timing chain cover with a new one, but all the new ones I have looked at don't have the timing gauge, so I was wondering if there was maybe a bolt-on kind that they make, better website that sells them, or something along those lines?