This has been discussed thoroughly here. Search previous posts for the KF-ZE topic. One of our wonderful moderators, Barry Clark (custommx3, his site is
http://www.custommx3.com or
http://www.barrykclark.com -- he may have his kf swap documented on there) has a 92 GS that I bought in Birmingham, brought to memphis, and after being through 3 or 4 owners, found its way to his drive... He has a KF in it, but it failed within 10 minutes of startup due to faulty/worn rings, it appears... You can find the KL-ZE for just a few dollars more, and as far as I recall, the electronics needed (VAF, ECU, etc) are more compatible with your K8 than are the KF-ZE's... Plus, you're talking another 30 horsepower from the KL-ZE motor, and a good bit more torque... WELL worth the extra $$, as well as less headache finding replacement parts, since there's a bigger market for the KL-ZE, and since it has an American market brother (KL-DE, found in MX-6, 626, Probe GT, Millennia). Do a search, and you're SURE to find everything you need to know about this, and if all else fails, email Barry and he'll tell you evertything you never cared to know.

Good luck!
Daniel