I've made the swap and use my 49 as a daily driver except on really bad weather days. I've driven from Kansas City to Minneapolis and to Phoenix at 70-75mph. Cruises good with a 350V8 and 700R tranny/3.42 rear end. I used the AD Engineering kit but you can fab your own if you have the time and tools. I wanted to get mine on the road ASAP so the AD kit made it quicker. Good quality. You can see mine here: http://s146.photobucket.com/albums/r246/49S10/