i'm sorry if this has been asked loads of times before

but going to be fitting a 2.0ltr zetec into my ka over the winter and i'm unsure wether to get a silvertop or a blacktop zetec as i know they differ quite a bit is it a lot more work to fit a blacktop in rather than a silvertop, also would a none pats xr3i or rs1800 efi, ecu and loom work ok with the 2.0ltr

cheers gareth