im going to be changing my grey injectors to either siemens,or rc not sure if i need to go as large as 1000cc but my greys are getting maxed now

also im getting a 4x4 head ive got ported and polished,thinking of going 27 on inlet and 25 on exhaust,and a 4x4 plenum matched to it(poss an ava sweedish type inlet made up)

is it safe to assume il need to send my chip back to be re written mate?