i think cams, throttle bodies, manifold back exhaust system, gas flowed head/port matched and mapping to suit the mods might be your best bet, im just going on the usual tuning for nasp petrol engines.
from what i hear, youd need to get recessed pistons because of the small valve clearance to run aggressive cams.
from what i hear, youd need to get recessed pistons because of the small valve clearance to run aggressive cams.