Here at Superior Glass Works we produce a reproduction 34-36 Chevy truck chassis. We have used two different Mustang IIs. The first, from JW Rod Garage, is a 'side mount' that puts your ride height just a few inches lower than stock. To get a lower ride, we use a Heidts MII for a '37-39 Chevy car. The outside frame width was nearly identical, but the car rail is a little thinner so there was a small gap to fill on the inside.

Check these out on my website: http://www.superiorglassworks.com/1934-1935-1936-Chevy-Pick-Up-Chassis.html

I can also supply boxing plates for that chassis if you need some for your project.

Brad
Superior Glass Works
www.superiorglassworks.com