Just to confuse you I would go the other way, sort of. My father-in-law recently bought a set of new MP XHD rear springs for his 66 Satellite, and they sat lower than the stock 40 year old springs, so he ditched those and had a local shop rebuild the originals. They just took everything off but the main spring. and added new leafs. They came with exactly the ride height he had specified. If you do go with new, though, STAY AWAY FROM MOPAR PERFORMANCE SPRINGS, unless you are going with Super Stock, because you will be disappointed. There is a thread on here from earlier this month that gets into those details. Espo is one of the better new spring sources.