Wow, you've done the work! Glad you are getting to the bottom of the problems. I've had the valve seat dropping issue ... and in Spades! .... but never noticed, or even knew about, the roller pin issue in the lifter. Of course, I haven't lifted many lifters out of the head ... only a couple of noisy ones.
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I've got two daughters driving a '97 Tracer each. I've been in each engine more than I can recall. (I almost cringe when the phone rings ..."Is someone having car problems?") ... but the engine is sweet when there are no problems; and together, the Tracers are well over 600 k miles.