Best headers for 360 in a valiant

Dillon Crowell said
I am going to be converting it to a 4 speed soon, I’m seeing stuff about having a modified z bar. Where can I find one to buy?

tti sells 'em or they have a document with measurements to modify your own.

here's the link:

https://www.ttiexhaust.com/Classics_ComAccRep.htm#ZB