If a set of springs 'rode like a buggy', then there was some other factor than the springs, most likely. 2 most common factors, incorrect installation (OE bushings tightened incorrectly) and shocks.
I know not many would run as much spring rate as I do, and it doesn't have a bad ride quality.
LEDs, yes, you need to run the correct flasher unit. Not a big deal though. It's best to not mix LEDs with incandescent bulbs, and I can't say for sure what the impact would be if you do.
I will have more first hand knowledge within the next couple months though, will share.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be
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