try
www.twincam16.com
in the marketplace heaps of people doing engine conversion practically giving away engines,
4a-fe are pretty common, theyre injected but go way better than 4ac of fc, i saw one in their being given away!
only problem is they are mostly from bris or sydney.
Otherwise i am doing a conversion in my ae82 in the next few months (depending on costs)and you would be welcome to my 4ac for a small charge.(still goes pretty hard)