CX/B18B1 swap

I am kind of a noob to the inner workings of cars so please excuse me if this is a dumb question. I own a 2000 civic CX hatch. @ the moment it has the stock motor w. headers, catback and an intake. a friend of mine told me he could do an LS (B18B1) swap for a decent pric. the question I have is will my curent headers still fit the new motor. IDK if switching from a 1.6 to a 1.8 will effect that or not. I really wanna know b4 i take the plunge and get the swap. Thanks for any input. :D

No, the header will not fit at all. It's a completely different flange and the header will be way too short (B18B block is a lot taller).