Time and Money... 2 key ingredients for what your wanting to do...

Well for starters the intake manifold and exhaust manifold are on opposite side on the Neon compare to the Eclipse.

The reason Neon owners do the SRT-4 swap or PT cruiser swap is because the engine face the same way with the intake manifold being in the front and exhaust manifold being in the back. So there's really not that much work cut out for them.

There is reason's why people haven't attempted this swap on their Eclipse and you can read/research it on 2GNT.com

There's only 3 solutions...
1) Build and turbo your 420a
2) Get the 2.4l out of a stratus I believe... there's info on the 2.4l on 2GNT.com
3) Evo Motor Swap from an Evo 8 because its been done. I'm not sure an Evo 4-6 will do but it faces the same direction as the 420a... you see 97+ Mirage owners doing this swap.


Just go to 2GNT.com and research.

The easiest of all of them if you want to stick with your car as a platform would be just building your 420a and putting a turbo kit on it.