hey guys i have an A14 that im going to reco and its got GX twin hitachi's (su's) and a set of extractors. im thinking of getting the stock cam re-ground to a mild cam and double valve springs. do i have to change anything else if i do as in lifters ect? also is it easy to get the twin hitchis retuned? ive heard su needles fit? can anyone comfirm this? oh yea any ideas of what duration i should go for? cheers guys.