To be honest if someone installed a 360 I would just leave it be and clean up their mess. I wouldn't put a 4.0 in it either. After fixing their mistakes in the engine bay then I would move on to the suspension. As far as upgrades go, that is all dependent on how powerful an engine you have or...
I have all the rest of the parts. Just not the intake. You can't buy the intakes new anymore. They are completely sold out everywhere and I can't find one, other than this one. He wants 550 which is high to me with the bolt tabs ground off. I just can't figure how to make it work with those gone