Alternator Bracket Too Short

[TugOwar]

In between periods of being frusterated by the 700r4 install I'm trying to straighten out a few others things that need attending to.

One is the alternator bracket. My 68 has the factory bracket installed, as pictured below (thanks Luv).

My problem is with the adjustment part of it. I forget the belt lengths at the moment but one length is too short and the alt hits the valve cover. 1/2" longer and the bracket is too short to tighten the belt.

I picked up an after market bracket (the arm part) at autozone that was longer but it had the wrong curvature. I maybe could have ground some off the lower edge of it and made it work but opted to return it, get my 12 bucks back and look for a better option.

Since this is factory bracketry I know some one else has run into this before. What did you do to correct it?