I have a '73 Z28 tribute car that started life as an LT. It does not have a rear sway bar. I want to add one. So, I have a few questions that maybe someone can help me with... 1) I haven't checked to see of the mounting holes for the shackles are in the rear frame. Are they there or is it a big deal to drill and tap the holes of they are not. 2) I have 2" drop leaf springs mounted on the car. Will a standard sway bar kit work or will I need to order a kit with shorter mounts? Any advice you could provide would be helpful.