37 spring behind rear on model a frame

OK, I'm building an Av8.and I want to use a 37 spring behind rear with my model a frame. How do I go about hooking it up? Can i relocate the rear crossmember back and use it with the 37 spring? Or do I need to fab a new one up and do away with the model a X member?

 

in my opinion you could "Z" the frame and move the rear cross back at the same time.

 

SamIyam did a tech post on this one... It's one of the cleanest setup's that I've seen...

Got my Traditional Hot Rod Chassis put together...

 

This one I like. Is the rear crossmember and spring hanger and shock clips fabricated or bought? iIf bought where do I find them? Also do you have pics of rest of frame?
Thanks a lot.

 

Never mind the last question. I read Sams tech article