ok i read the whole parts point thread.

I just pulled the lift pump off my 93

It says AC spark plug.....is that a company or something cause alot of stuff on varies gm cars say that?

EP 158

6442656

OH...im wondering if thats a HO version or what? This doesnt match any lift pump numbers ive seen, not even a digit or 2

That's the HO, from ACDelco (cross GM 25115224)