Shimming the rear block seemed to be fine for my car
You need to trim the block slightly so that it doesn't come into contact with the motor plate or gear cover.
Otherwise, Jimmy's method of turning the front block upside down helps too - but I found I had to mill the plate slightly for this to work and it still doesn't allow you to run 0 degrees.
I will post some pictures of mine when I get home from work, using both methods you can get 0 degrees without much trouble
