with my old l20et i used vg30et injectors. which are 270cc, if you can find any near you that would help. Im pretty adimint that the l20et ecu will run the l28 happly.. But you;d need to swap the oil pump/dizzy drive and dizzy over to the l20et CAS unit..
Check to see what oil pump is on the l20et to.. Both of mine (JDM) had the same oil pump as the l28et Automatic. H4 rings a bell, I'd have to confurm that tho..
Ive done the some converions in my Hr30 skyline, She isnt running yet.. (funding) Orginialy had a l20et, now a n42/n42combo with l20et gear and alot more.