What headers work, and what don't?

Ah, I see what you mean. Honestly speaking the whole driveline is a mess anyway since I'm still trying to figure out where it all came from. It's a mid 70's 318 with a 73 4 speed and some year F body 8.25 rear end complete with the F body leaf springs and isolator boxes. The spring perches are too wide and weren't moved in, so the springs sit bowed out and squeak horribly, but slowly I'm getting things straightened out. The car actually drives pretty well for the Frankenstein it is, lol. I plan to put in headers when I put the new K frame in since I should have plenty of room to work with, but I'm not sold on what brand yet since I need to see what fits well with the stock Z bar setup.