the swap is fairly simple, just measure from drum to drum to see which length will work best for you as a sn95 rear is longer than a 79-93 rear. the perches are cheap but they need to be welded on and it must be done right . as for lowering a leaf spring car you mount the spring on the underside of the rear instead of the top. Price shouldnt be too much,depending on what youre looking to do id say 500$