Ok some more info about the new leaf springs. The car sits about 2,5inch higher then with the previous setup. Keep in mind, I have ordered custom 7 leaf springs with 1 inch over the stock height. Going from 5 tired leaf springs, the car seems to be much more tighter reducing flex and the difference is immediately noticeable. However for the overall car stand, I´m thinking to adjust the front torsion bars a little higher to lift the front a bit, as the rear is bit too high and Polara look reminds me 70s lifted up camaro. But in fact, photos were taken with the 1/3 of gas tank and no occupants, so I can easily add some weight. Finally I get rid of the occasional vibration of the dual exhaust touching the body, too. So in general I´m happy for the upgrade and would not believe the difference in the car behaviour with the new leaf springs.
Its good idea to get all the parts new, as you never know which bolt you snap in two pieces when removing the old parts or get stucked with the old grown up bushings in shackles. Below are few before/after pictures, but I have to use some older pictures for comparison as it was heavy rain while going back from the shop.
To answer the topic question Rear Shocks and Springs: One Day? I think its possible. One side took us 3-4 hours, without the shocks but they are super fast to change while you are working on the leaf springs. It could be faster if I made a better homework and knew we needs to remove the housings = applied some oil in advance to make unscrewing nuts easier.
But definitely I can recommend this upgrade to everyone, you will be pleasantly surprised with the results. For the listed pictures, please notice the inside view picture. Even the hood looks shorter due the rear side being lifted up
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