The heads will interchange, however the 1G head will not work in place of a '95/'96 head where the CAS bolts to the head behind the cam gear.

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Use the Search, this is definitely covered.
You can use it but not without modifications. There will be some wiring to do as well as the head bolts/studs are different sizes between the two as well as intake ports are different sizes requiring a 1g intake

oh. ok thanks bro. ill look into it.

ok. thanks dude. ill look into it.

dang it's a little more work thank i have time for right now, i guess i will just look for a 2g head. thanks a lot guys for your help.

abelpescado said:

dang it's a little more work thank i have time for right now, i guess i will just look for a 2g head. thanks a lot guys for your help.

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Not really. When i did mine everything went right together.

i can be done but it's not simple replacement ...

RRE has a detailed how to on their site
RRE's Eclipse 2g Turbo to 1g Head Swap Tips

i am in the process of doing this myself (i bought the car with it already but incorrectly)

Its well worth the work. 1g intake ports are massive compared to a 2g.

Well what are your goals for the car 1st before you set off on this adventure of swapping the head? If you are not planning just to make the car an all out drag car i would leave the 2g head on there. That was my plan at first to make massive amounts of power but now the goals for my car have changed so now I have done what i could without having to switch the heads again to keep lots of low end power and tq