do the rockers wear on the evo's.
The rocker shafts may be worn. I replaced mine around 100k and alot of my noise cleared up.
It shouldn't be too tough to check and it'll only cost you a few $$$ for the replacement gaskets.
If you plan on putting a few miles on it this year I would check them just for piece of mind.
How old are the lifters? Once you get past 100k miles the possibilities of what is worn out are huge.
If you heard the noises my '84 makes you wouldn't be worrying