Earlier this year before digging into all the shortbox stuff I quickly fixed up the exhaust on the cheap. I didn't want to spend any real money or time on it but the PO had true duals running glasspacks dumping under the box which were undriveably loud to me. I got basic $40 Walker mufflers and threw 'em on. I wanted to put in an H-pipe but there was no simple way without replacing most of the pipes. It actually sounds amazingly good! Reasonable volume, but you can definitely hear it's an old big block coming.
Here is one side done. You can see the far side has the old setup.
And both sides complete
1974 F250 4x4 CCSB, 460 Swap, 4 Speed
1988 F350 4x4 CCLB, 7.3 IDI, ZF5 Swap, 4" Lift