Anything will improve the situation over stock. Your shocks have 40 year old oil that is degraded, as well as old, hard seals and are generally completely used up, likely many years ago. Lots of people really like Ikon over Hagon, and I would agree having handled both. Hagon are nice and the steel body looks more stock, but the Ikon are regarded as a better shock overall by many. I would also forget progressive springs up front and go with Race Tech emulators and straight rate springs. Suspension is what keeps you in control, and its the last place people should cheap out, but often the one place where they do.