/6 dual exhaust. bad idea?
When I had the slant in my Cuda I had 6 into 2 headers and had the exhaust bent up like a v8 dual system (2.25" pipe, glass paks) with an H-pipe. When I dropped in the 360 all I had to do was flip the pipe that crossover from the right side and it lined up almost perfectly with the right side header collector on the 360.
Before I put in the H-pipe it sound nasty as in bad but the h-pipe smoothed out the sound and I was constantly getting complements on the sound (no sound bite, sorry). If you are starting with a Y off the manifold it should do the same thing as the H-pipe to the sound. I would go for it.
Here is what my car looked like with headers and a 4bbl.