? on 7 1/4 to 8 3/4 rear end

OK THE MYSTERY IS SOLVED!!! I took my tranny and stock converter to my engine builder(Dan Costello @ Performance Only in Delray Beach Fl. He called Hughes and explained the situation(which he has seen before and they are building a special order converter so it fits my tranny and the 360 crank at no additional charge than if I was buying one from stock!! Dan said he could make the spacer but why if Hughes will build one. Thanks for all the input, learn something new everyday!!! Thanks A bodies!