[84GT350-1]

What kind of additive should I use with a stock traction lock in a 8.8?? Anyone have some tricks for getting the upper control arm bushings out?? Also, What purpose is the chunk of cast iron mounted to the center section?? Is it a vibration dampner?? And do I need it?? This 8.8 is going to replace the 7.5 in my 82 GT.....Thanks for your help...