You should be able to get first gen integra engine parts pretty readily in the US. It doesn't have quite the same "unique" parts as the ZC, so a trip or two to the junkyard can get you a decent crank, and as far as sleeves and pistons go, I would suggest going to honda first and seeing how much they will smack your wallet for on pistons. From there you can look around online for some ZC cylinder sleeves and have them put in and bored to your piston size.