Do yourself a favor and sell that case for scrap - which it basically is.

1) if its seen average use, the front countershaft hole is going to need to be bushed and should be done on a mill so the hole is bored in the correct location. Even if it were a new case that hole should still be bushed to prevent future problems (they were machined for a floating shaft, not press fit like the iron cases).
2) they don't have anywhere near the strength of an iron case and are prone to the ears breaking of where they bolt to the bell.

Any good tranny guy like Brewers or Passon will tell you to avoid them like the plague. If you're wanting an OD trans, put the guts in an iron case and use a 307 bearing.