Need some help with rear axle position

I have a cut down 8 3/4 rear end in my car but I am not sure if it is positioned correctly. The drivers side tire is rubbing on the outside wheel well and the passenger side is almost rubbing on the inside wheel well. I have wide tires.It looks to me the axle perches need to be about off set by an inch.
Are the perches normally offset? Any advise on this would be appreciated.