Raven has a massive fail again.
The best place that I could possibly send you to get you started would be 6gc.net
It's a forum for 6th generation Toyota Celica's.
There are a few members that have swapped out their 2.2L 5S-FE engines for the 2.0L 3S-GTE engine found in a GT-4. There are 3 or 4 of them that have not only done a full GT-4 conversion (engine swap, AWD) but have also made it RHD.
The link is below to give you an example of what could be the finished product and I wish you the best of luck with your progress.
Yes... You will need about $6000-$10000 for this... however there are always people on the site that are selling their cars as well. I will give you a link to that as well.
If you are just interested in the engine swap, that can be done for around $3000.
http://www.6gc.net/members/190
http://www.6gc.net/photo/highres/190/7
Gorgeous car with a little over 300 ponies to boot.