The h22 block+gb weighs 16kg more than an equivalent b16 block+gb (source: honda-tech).
A turbo with manifold and associated gear will weigh almost 16kg, especially with a cast iron manifold. What's worse is that all of this weight is placed further in front of the front axles in comparison to a H swap.
Now you go and boost your b18 and be outhandled by a boat anchor.