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the job of shocks is to dampen the springs. In theory, without them, the springs would bounce forever and never stop.
imho shocks should be replaced when leaking, but otherwise, there may not be any benefit when replaced, if there is not excessive bouncing already. Remember this car got a .73g on the skidpad which is in 1970's territory, it's pretty soft and it has been described as a mattress on wheels....