Any help on what parts would be good to build a all motor ?

 

Easiest mechanical solution: buy a 07+ altima 3.5 or a 09+ maxima 3.5 and swap 3.0 timing on it and tune with whatever solution you like best. It'll out perform anything you can do with a 3.0l.

Or if you're into wiring.. Figure out how to do a full swap with all the 02+ harness, NATS, pedal and all that and then swap to the newer 3.5. Full swaps will yield more power through the rev range.

Any information someone capable of doing either will need can be found in a search.