If you spend a little bit more, around $1800, you can do a conversion of 1.9-2.4l (possible for less depending on deals on parts, and machinest). I'm currently in the midsts of this project with my gt. Here is a fantastic article that gives a good overview of the project: 1.9-2.4L Also a search on the forum will yield lots of information on this conversion. Otherwise, as has been said, call ogts, opels unlimited, and the other opel parts places listed in the parts links. A used 2.2l should be around $1500-1800. If you want to stick with a 1.9, these can be had very cheaply. Good luck to you with you project
I once met a guy that put an Omega 2.4 engine in his Manta
(Omega is i think sold as Cadillac Catera? in the US) however i didn't see the engine or know much about it, but aparently its a very easy convertion.
Have a look at the Intrepid Adventures of Greensmurf20 in the thread "Economical CIH Engine Rebuild" There is heaps of information in that thread about putting a 1.9/2.0 litre engine together and getting it running. Most of what you need to know is there along with "DO's" and "DON'Ts"