66 with 86 cross member what do i buy

[Mistercates]

I just picked up an 86 cross member and want to go ahead and lower it while im putting it on. What is the lowest you can go without notching? I have heard 4 front 5 back. Also do i just need to buy drop spindles and springs for the cross member since it already has disc brakes? I have read the other forums but just wanted to make sure before I purchased anything. Also will i need an adjustable track bar for the back? What about sway bar for the front?

Thanks!