rear end shortening questions

I am putting a b-body 8 3/4 under my Dart Sport. I asked this question before but not on this board. Anyways the general reply was that I not shorten the rear and just buy wheels with offset. I am still wondering if it just wouldn't be worth having the rear shorten to a-body length to avoid any offset and tire size issues all together. I was thinking maybe finishing it all off than with some moser axels. What do you guys think?