I asked the same question on my 38 desoto. and I was given this. http://www.teufert.net/other/rear%20...dimensiona.htm
it is a site that i found useful for my 38 desoto this is on one of the other threads left by Timothale. I also saw a thread on using an s-10 frame. They come in 3 different wheelbases and are not to wide they also come with disc on the front and ifs not to mention the aftermakert supplies that are readly ava for the the s-10 suspension. you may look into that.