Those universal " X pipe kits"....

I have the Summit 3" X-pipe kit. It's not a bolt-in, you have to cut the legs to fit.

I knew from the beginning it wasn't going to fit in front because I put Hedman B-body headers in my lowdeck A-body (the collectors don't line up with the torsion bar cutouts). Four mandrel-bent 18 degree elbows from mandrelbends.com and some cutting and welding to make shallow doglegs, and it all lined up. Eventually!