reccomendation

Hello guys, need advice from sifu's here.

I've got a friend who wants to mod his super duper STOCK 4k engine in his Corolla KE70.

I advised him already on swapping the engine with a 4age, particularly silvertop or blacktop.
But due to his budget, he can't. so just sticking with his 4k engine.

And now he plans on going BIKE CARBS, because weber is just damn expensive!! not to mention a monster of FC. any ideas on how to do it? if so, what bike carbs is suitable for it? Cheapest one...