I know the GTs are 57/43. Don't know about V6s. I don't think there's a huge difference weight wise when the motors are fully dressed. I'd go out on a limb and say less than the weight of a 10 year old.
Aluminum explorer block saves like 75lbs if I remember right. A/C delete is around 30, K member, tubular A arms, aftermarket exhaust trims a lot believe it or not. IRS would add weight to the rear which is a good thing considering it out trades the SRA in terms of handling.