remove it and get twin SUs :jamie:
aisans are piss easy to tune, my old one had better throttle response than most efi cars i've driven. use one without all the emissions crap, just pcv and high speed valve, and run a rich idle with the best vacuum you can get (hopefully 18in/Hg or higher)
floating spacers are illegal and dangerous, just cut the brake caliper down with the angle grinder, it's free and it works, the bit that pokes out is there for cooling only. if you swap to ke55 brakes, then you won't have the clearance problem either
i had those same wheels on jap calipers on my ke25, then later on ke70 calipers