Ok, so here's my questions...

Is there any benefit to changing the fuel system on a MY00 from side feed to top feed, and if there is, how hard is it?

Do the top feeds just drop into a '00 manifold and the rails will sit on top or is there more to it?

Are aftermarket rails worth it, or are they just for ease of plumbing and bling?

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Balls.

what do ya wanna do? Like why? Power?

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with a MY99 you should be able to plonk a GD manifold directly onto those heads, TGV's with top feed injectors, lines etc everything. the injectors don't just swap between topand sidefeed the mounts and rubber collars are physically different.

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MY93 Impreza GX 1.8L, 0hp, 0nm

Yeah, for power.

Only prob with GD manifold is the throttle body. Fair bit of dicking around with that from memory.

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Balls.

Do GC and GD injectors us the same plug for the wiring?
ie. Can you just unplug the side feeds and plug in the top feeds?

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Balls.