HEY PAUL,the first thing I did to my el camino when I put the 572 in it ,was relace all the springs and shocks.Ireplaced the rear lower control arms with a pair of boxed arms.I changed my stock 12bolt posi unit to an eaton posi.Lastly,I replaced the stock th400 with a heavy tci tranny.Believe when you change over to a 572,you will be amazed with the torque the engine puts out.Goodluck with the changeover!FISHMANJOE