my mags went striaght on they 185/14/60R, perfomance mags aare easy to get just go to a tyre place ask about em (superlites)
the 32/36 weber on my A12 goes much harder than the 20/26 hitachi, take off is much better
my mate just bought a datto ute with a A15 in it and there is not much differnent bettween mine and his
but he has the standard hitachi and no extractors.
from waht i have learnt on this site is that the A14 and A12 motors rev much harder than the A15, and they are easier to work
the best thing to do in my opinion is to change your heads to A14 (get heads worked),get nice big extractors (2 and half exhaust), get your cam worked, put in electric fuel pump and put on twin 40mm DOCH sidedraughts. this will give a nice fast ute ute for a cost effective price
p.s this what i wanna do to mine as welll