if you want to modernize the old girl a bit go hydraulic. If you want to keep it simple stay mechanical. I just remember putting a slave cylinder in an S10 or some other old turd Chevy for a past girlfriends mom. This was at least 35 years ago. The old one leaked like a sieve and bleeding the new one was a pain in the arse...LOL. I've read quite a few threads on here where not choosing an original style pressure plate causes clutch pedal to brake pedal alignment issues.