Exhaust system for 402 SWB?

[71CHEVYSHORTBED402]

My exhaust guy is paying the truck a visit tomorrow. My guess is he's going to have to customize this, but he wants me to look into a kit perhaps, and mufflers. I'm using the original manifolds, and hope to hang the system by the original mounts.

1. I'm working with a 402/400th SWB that's primarily original. However a 4/2.5 drop if it matters. Also if it matters, the odd duck has leaf springs, the was built on a frame

2. I'd like mufflers similar original, though if I had to choose among others, a deeper slow grumble sounds awfully nice too. Cost doesn't matter at this point, she's a money pit. I just want her to breathe right and sound good.

For what worth, here are the notes I took of the original assembly; not to say some of the hardware wasn't altered at some point Thank you for any insight. EDIT: I can't delete the image, which isn't quite right. So a corrected version is below.