From what I understand it isn't . The A303 is a performance upgrade from stock if I'm correct. The Bi#%h is nobody has applications for 5.0 from 96 up, When they started puttin mod motors. Seems like they gust stopped with the hipo goodies. So what I'm trying to do is fit old numbers and see if they work. Try and find a trottle body for a 97 or 98, or Maf, you'll know what I mean. I also have to brothers that are techs at ford and i still have a hard time figuring **** out. I would like to find something that tells me exactly what my truck haslike -Maf size , injecter size, valve sizes on the GT40P heads,Header manufactures for the same heads, and a number of other thing but don't know where to go.