mufflers

i have been lurking in the background for a while now. it has been a long (20+ years) time since i have had an a-body and have forgotten more than i remember.....anyway, i am hoping to get started on my project in the next year or so, and would like to start hunting/ordering parts, at least the ones that will fit no matter what motor ends up in the car. will be relocating the springs and would like to keep the factory fuel tank. i dont really like the idea of snaking the tail pipes thru the springs, is there any company that makes mufflers with the inlet/outlet on the same side? i had a buddy that had a set from spin tech and could not stand being in the car, they resonated so bad i thought my ears were going to start bleeding.....