If I'm right Nick... Worzel's on 800's, I'm on 650's on my 2 litre but Lucky is on 550's on his 2.5.
I'm sure you could get away with the pink's as you say at a low mapping to run in but definately will need more fuel once the syvecs is installed to really make the most of your engine.
Crikey...I almost sound as though I know what I'm doing!