That should work fine... carefully pry out the old one, but first note the installed depth.... on the heads I have here, it appears that the edge of the seal is flush with the head casting. A large socket can probably be used as a seal driver/installer. Examine the seal surface on the cam for burrs that could have cut the seal lip.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum