You wont be able to use an AWD EVO/GSR/VR4 clutch as it sounds like you've still got a FWD gearbox and FWD flywheel.
I presume at the moment you've just put your OEM 4G93P DOHC FWD flywheel on the 4G93T GSR engine and that is an easy and OK thing to do for what you have now in FWD setup.
But as soon as you change to a 4G63T engine, you're going to have some dramas sourcing a 4G63 6-bolt or even 7-bolt FWD flywheel to suit a FWD 1.8 Proton/Lancer GLXi gearbox.
Your FWD gearbox bellhousing hole size is 275mm in diameter, therefore ensure that whatever 6 bolt FWD flywheel you get, its size will measure slightly smaller diameter than this (including the ring gear teeth).
A normal 4G93 1.8 Proton GTi/Lancer GLXi FWD flywheel measures approx 268mm in diameter including ring gear and uses a 215mm diameter clutch disc.
You may have to source a FWD flywheel from a 6-bolt 4G63 Hyundai Sonata or Ive been told even a Mitsubishi Cordia turbo? Im not too sure of the exact specifics, as most people I know of just modify the AWD EVO/VR4 flywheel to suit.
What they do is have the raised stepped sections of the VR4/EVO AWD flywheels machined (and balanced) completely flat on the side that the pressure plate bolts onto. This will make it fit inside the FWD gearbox no problem.
The only downside is that because it is now a flat FWD flywheel, you can only use a 215mm diameter 4G93 FWD GTi/Lancer GLXi h/duty clutch kit. So if you like the clutch kit one you had before, just buy another one exactly like it.
Ive known several people to do exactly this thing for this type of conversion, therefore its probably your easiest and perhaps cheapest option overall.
You can still use the existing VR4/EVO starter motor too as you havent effected the ring gear teeth on the flywheel in any way
Whatever you do, DO NOT go shopping for a Mitsubishi Eclipse 4G63T FWD flywheel as they are 285mm in diameter including ring gear and physically cannot fit inside our Lancer FWD/AWD gearboxes.
The FWD Eclipses use a larger bellhousing transmission similar to our UF Nimbus does.
FYI, they run a 230mm diameter clutch disc.
The other alternative for your 4G63T conversion is to convert an AWD gearbox to FWD. But the cost in going this route is quite expensive because it involves a lot more work and parts.
To do this you will need an AWD gearbox for starters... preferably an EVO box with LSD = $$$$
Then you will need to buy a 2WD locking spline and fit it inside the back casing of the AWD gearbox... but it will make the AWD's gearbox centre diff spider gears a weak link that has often easily broken in many FWD converted 4G63T's.
Therefore you're better off forgetting about the 2WD locking spline, and instead open up the AWD gearbox and have the centre diff pinions welded in place. It will be much stronger and lock the AWD box to 2WD cheaper!
Then you can either keep the ouput shaft for the transfer case and viscous coupling in the box to hold the shaft in place, or you can remove the viscous coupling and shaft altogether and then fill in the hole where the transfer case output shaft once exited through the bellhousing with a welsh plug.
BUT, even now that you have an AWD gearbox box converted to FWD, you still cant fit the AWD box without an AWD K-frame and AWD crossmember from a GSR or EVO!!!.
This is definitely not the most cost effective way to go unless you have the parts available to you cheap.
