OK.. I have a 1966 Fairlane.. 521..C6.. I installed the Big Block Moroso Trick Springs in the front.. with everything installed i couldn't get the front end to budge with me (6'5" 320) standing on the front jumping up and down!! They are the ones for a BB in a Fairlane.. So I have a friend i race with that has a 66 chevelle that had SBC front springs, new laying around, so i tried them.. they are a little bit narrower, little shorter and smaller wire diameter.. Now if i stand on the front end and jump up and down it moves about a inch... what gives.. car is still sprung like a cat!! Do i have to just start cutting coils? What a pain!! Has anyone else had this problem? I need to get the car to ride height so i can get it aligned.. Thanks!!