As the KV already makes 136bhp youre not far from your target.
Intake ports may help you get there if theyre worked over, exhaust also.
There are some calculations regarding header primary lengths and diameters but ive no idea if the 20 valve manifold is anywhere near it, however, id suspect itd not be miles away as the 20valve is almost the same capacity as the KV with similar exhaust pulse separations so it might work...it might not.
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