Reverse or standard rotation water pump and '69 timing cover on a 93GT

[Stang_ROTY]

I have a '69 351W block and need to which rotation water pump I can use, what the difference is between them, and why I was told I can't use a 69 351W timing cover in a mustang. Thanks in advance

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Almost done!
93 GT, Dynamic C4, 8 pt cage, chute,
Sothside Machine bars & Sub-frames, 3.73's
'69 393 stroker w/SRP pistons, Edlebrock Performer heads, Performer RPM Upper & Lower Manifold..Crane Gold 1.6 Rollers Comp Cam..BBK 70MM TB, ceraminc shorties & H-pipe w/cats..30lb Injectors..Cartech Fuel System