Only mod motor early mustang i drove that handled great was using Griggs Racing.The cheapo mustang 2 sets up really made the car handle funny.Rrs has some nice parts but if you want a 8.8 griggs is the only easy way i know of.For the interior
http://www.mpcustomproducts.com/ led tail lights and turn signals and reverse lights
http://www.mustangproject.com/ i got a ton more mustang sites so if you need help on parts let me know.