Most of the sensors are the same on the 2.5L and the 3L engines, I believe. The knock sensor may not work, but making the 2.5L sensor work on the 3L engine is a simple matter of drilling and tapping the hole on the 3L engine to fit the 2.5L sensor.
The engine mounts are the same, though you have to use a 1998 or newer engine to bolt to your transmission correctly.
Do you have any pictures of your custom intake manifold? It sounds very impressive.
Bob
