5610 would be for the heaviest Gbody option (diesel with ac), I believe I have the 5600 (SBC with ac) in my Monte with an aluminum headed BBC it still dropped the ride height but rides and handles well also being an aftermarket block etc it's heavier than stock
When I had a Pontiac 400 in my 1981 Malibu wagon, I used 1977 Trans Am springs. I have no idea what the part number was. When they first went in the nose was pointingto the sky. I slowly cut off a 1/4 coil at a time until I had the ride height I wanted. I had to cut the 1/4 coil sections 3 times for 3 /4 coil total. A little means a LOT! I ended up sitting about 3" above stock height, with a VERY stiff ride. Exactly what I wanted. I pulled the coil spring up into the spring tower and used a cut-off wheel to remove the 1/4 coils. The overall installed height on an F-body is about 1" taller than our G- bodies. Think of a coil spring as a torsion bar.The shorter it gets, the stiffer the action.
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