Ripping from a ROM

Do you mean Classic tiles? In that case, they're already in ZC :P.

I'm trying to rip Zelda II tiles.

You don't have to rip them, people already did that.
http://www.spriters-resource.com/nes/tloztheadventureoflink/

You could probably find some on PureZC too.
http://www.purezc.com/

Thanks. How ironic; I found that site just earlier today. Weird, huh?