You won't need an adjustable FPR with 24# injectors. You will need to the fuel pump, though.
As far as what you can lose with a faulty FPR, you can lose your engine because of a poorly managed fuel supply. You also lose $15 that could have been put toward a quality FPR, or, better yet, the fuel pump you absolutely should have.
The thing that would concern me about a used FPR is that even though it may have worked on the car of the guy you're buying it from, the diaphragm has been exposed to gasoline and has now been dried out. It may crack and cause fuel to leak directly into the intake. This could cause backfiring into the intake and no start conditions.
Hopefully it will work out for you.
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