Basically to replace the vavle seals is a pretty straightforward thing if you dont learn it the hard way like I did. Pretty much with a car that age the seals are probably shot.
To replace them
Basically you
pull the valve covers
remove the plug on the cuylinder your fiddling with
insert a tool to pressurize the cylinder (AutoZone $10.00)
apply compressed air to tool (just squirts air into the cylinder- through the spark plug hole)
remove rocker arm
install valve compressor ($8.00 Autozone) (use the rocker arm- nut to do this) (I had to bend to tool more than it already- was to fit it in but it worked well after that)
This is the tricky part
Make sure the air is going into the cylinder
pull on tool to compress valve spring (you may have to tap it with- a wrench just as to start to compress it to dislodge- keepers)
take out the keepers
put them somplace safe (you might want to purchase some- spares in case you lose them i did and i needed them)
pull the spring off
remove the cup seal at the head and the oring on the valve
install the new cup seal
THIS ORDER IS IMPORTANT
reinstall the spring
Compress the spring
install the oring in the SECOND groove on the valve
install the keepers and remove the tool
DO NOT release the valve compressor once the oring is installed and before the keeper is installed
install the rocker arm and set the lash by twisting the pushrod while tightening the nut. The pushrod should just turn with your fingers and no axial slop should exist.
After this is done done if the engine ticks just remove the vavle cover and set the valve lash with the engine running (kinda messy but really easy to do, use a feeler guage to find the culpit, since this is a no lash system the guage shouldn't go through )
just tighten the nut till the noise goes away.
Hope this helps :Twist