i've got a z32 afm as well, but i really want to upgrade to a gt3076r with the 4" anti surge port comp cover, i didn't realise the whole afm dilemma until i saw it here.
oops.
i've seen the afm in intercooler piping done a lot in VL turbos
it makes sense to have it closer to the throttle body, and it would measure the proper density of air as well (if its placed after the intercooler)
but im just making suggestions, speak to your tuner and see what he says
otherwise, maybe go for a d-jetro setup?