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If it does have the hydropneumatic be very careful - the costs to repair can exceed it's worth. You could be better off just buying a good Rolls selling on the market with a roadworthy for probably less bother. The 1970's Rolls are probably the worst decade for this car manufacturer - However if you're really lucky and have a 2 door soft tops they always hold a better restoration value than the 1970's 4 door Silver Shadow could ever achieve.