I have a 3" bb but am considering buying the EVO springs just to upgrade the front. I'm asking is it worth it to take out the front bb and installing a full 3" spring to replace the factory coil spring and bb? And is that even possible and an overall good idea?
So you have a stock coils and a 3" puck as your lift? Who makes 3" BB's?
Anywho you can definitely do this so long as you already have longer shocks or shock extenders, which I'm hoping if you're already running 3" of lift. You would also have to address your front driveline on a 4dr and front and rear on 2drs. It's expensive when you do it right, which also includes potentially correcting the steering geometry with a raised trackbar bracket and drag link flip. Oh and don't forget adjustable lower front control arms to correct your axle caster. Oh and brake line extensions or longer brake lines.
I say all that to say: save up for a kit, like the EVO enforcer which comes with all of the above (minus Drivelines) and will be your best, quality bet.