is head work a good route to go down?? or wil i not see the noticeable increase i wud want for the cash outlay necessary? my cylinder head already been built up so would mean a complete strip down again

also, standard rods and pistons?? need uprating? or at least maybe lower the compression by machingin the pistons? iv never really been given a difinitive answer to this

in terms of 5th injectors, are these stil a bit primitive or is it the only option with mfi to get the right fuelling?