Pics of my exh on my 63.

Nice, real nice. I have done this as well. The over the axle part I have picked up Flow Masters universal kit and cut and welded in before.
On the headers, a nice kit for the regular small block headers is the extention kit from headman. These pipes are "S" bent to bring them closer together and clear the tranny cutouts.
I gave up on cutting up pipe from the "H" section. At the price for a Jegs/Summitt unit, it's worth the price over the effort for me.