Engine info help

[gabbin]

I have a 14093638 block with a K0209PHA stamped front. I cant find much info on PHA suffix? The engine is 87-95, I need a couple of roller lifters replaced they are weak, so what I'm wondering is, how can I determine the exact year this is, and two, were all roller lifters the same part number for replacement?
Just for info purpose, the heads are an earlier, 487X 76cc 2.02 1.6.
She runs really good but, the intake rocker on cyl 3 simply wont adjust all the noise out, actually it will on initial adjust, but comes back after a few seconds (this was on a hot adjustment, untill it basically bottoms and starts to rattle or knock so to speak.

That said, I'm going to replace all of them, but want to ensure what I'm ordering will be right, having a hell of a time narrowing this exact year block down.

Thanks for any help and feed back fellas!!!