would bodies from a 600 gsx be big enough for a 2 litre zetec?

Yes,
PPC mag did a feature on them a while ago and said 600cc TB's are good for up to 200BHP.

i'm using GSXR 600 TB's on my 2.0 Zetec, if you get the later ones you will need to remove the 2'nd butterflies and blank the holes.

HTH
Ray

More than adequate for the way you drive Conrod!

Cheers,
James

watch it james....remember i still have some cash of yours in my pocket
ta for the sensible answer ray