I just got a 1987 GMC 3/4 ton. I was hoping to up it's performance with some add-ons. So far, I've been looking at a new TBI unit, headers (JBA or Edelbrock??),muffler-less cat-back exhaust, and a new performance air filter by green. This is my first vehicle and although I am familar with mechanics I wanted some opinions from some experienced individuals. Thanks in advance