Hello folks! I'm helping a friend work on his newly-acquired 1971 Riviera. Currently, it's all-original, and a very decent car. Non-Buick-types may think the boattail design is controversial, but there is NO denying that this thing is built SOLID. maybe a little too solid...the crossmember drags on bumps at speed, and we're thinking that the springs are tired, so we're looking to upgrade the springs and shocks. ;P OPGI offers a dizzying array of spring configurations...They offer std-spec stock ride height (for cars w/AC), as well as aftermarket 1/2/3" drop, for 1971. They also offer an "HD" option for 1972 cars. To add to the options...Jamco offers 1/2/3" drop springs online as well. Have any of you had any experience with either OPGI or JAMCO spring sets on this or a similar car? Any reason why the quoted-1972 HD springs wouldn't suit our 1971 car? I think the 1" or even 2" drop could look very good...but we are wary of dropping the car into more ground clearance issues, and are probably leaning towards a stiffer Buick-fit spring set if we can find one. Would we need special shorter shocks to work with shorter springs? I called OPGI, and got a very, very courteous sales person who assured me that the drop springs were designed to give a "stock ride feel"...dunno if that means shorter springs are stiffer, or just shorter. I'm hoping to hear some input from people who've experienced these cars and products firsthand. Forgive my scattergun approach...I'm new here, and I appreciate your input, folks!