Pinto Car Club of America

Does anyone know what the narrowest/skinniest part of the subframe inner width is? Talking from the firewall back as far as it goes. For example if I wanted to run one piece of tubing from front to back on the inside of the subframe what is the widest that would fit at the narrowest point. Talking width only, not height.

I don't really expect anyone to know this, but figured it can't hurt to ask. Running different ideas through my mind.

Thanks,
Russ