What I have done in the past is take the sub frame to a sandblasting place and leave it. They blast it prime it and paint it. Then do a lot of measuring AT LEAST TWICE before cutting anything. Rear end like I think I said earlier I just buy a camaro that was hit in the rear or a rust bucket around here you can buy them for under $500 and around $1000. with a 350 eng and a 350trans not to mention the 10 bolt rear and springs which will work under the truck. You can compensate for the track width with backspacing on the wheels. Don't get me wrong I have used Mustang IFS before and they work well I just put one on my 53 ford wagon. I just like camaro's for early chevy & GMC p/u's. I think you get a lot of bang for your buck that way.