Depends on how much money u want to spend. If u do the work yourself maybe a couple grand. Or part it out but you will have time and effort. Or just try to get your money back out of it. I would put it on Craigslist as a parts car. Maybe trade for upgrades for your other car.
I have just put a new head on my 1g. And it has a knock that sounds like a lifter knock but only does it at about 2500rpm. But goes away when i unplug number four injector.
Before u take ure head in u should call Cylinder Heads International. 1-800-942-4503. I have the same problem in my 93 talon and a head is $265.00 ship to u. All u have to do is send your head to them after u get the one u buy put on.Comes with valves,springs, rockers and cams.