Yep that's exaclty what I did on my '90 4.2. The 95 slave/master will work but some you have to drill out the hole on the end of the master push rod to fit over the clutch stud its plastic so be careful . Also on some the bolt pattern is diffrent on the master so what I did is drill the flange to fit the existing bolts in the firewall. Other than that what clutch you getting? If your unsure of its condition it might be a good time to replace it too.
build thread: http://www.jeepforum.com/forum/f22/skyj-eccentric-build-1467426/ '90 YJ 4.2 with 4.0 head, HEI. AX15, NP231 SYE, Dana 30 4.56 open/ 8.8 4.56 detriot locker. 1" shackles
2" BL, 4" stretch all on saggy waggy springs.