i am with the others in that i would refurbish what you have as it works well for you. no need to spend money for something that, while it would work well, would be a pain to install and setup. if you really want the chevy truck style trailing arm rear suspension, get a copy of stock car products catalog. they have everythiny ou need to swap over to the truck arm suspension. bear in mind you will need to some welding, including on the rear axle housing, and you will need to do some fabricating, adjusting crossmember lengths fabing up gussets, etc. one other thing to bear in mind is that the chevy truck arm suspension really plants the rear tires when you accelerate off a corner, and can cause damamge to the frame rails unless they are properly reinforced, and the chassis properly triangulated. and if you dont get the setup nearly perfect, very small tolerances in settup, your car will become a handfull to drive and you will hate it. the 4 bar suspension is tried and true on street rods, and is good for drag racing, and street driving. you can make it work on a road course, but it is outdated for that kind of racing. if you reall want to change the rear suspension go with the four bar and coil overs as everything is easier to settup, and like i say it does work great on a daily driver. leave the truck arm suspension to the chevy trucks, and the asphalt racers.