What would be the difficulty in the installation of an civic type r b16b into a civic ex 97 four door ? Debating between this and a gsr or integra type r engine.

 

B16B, unless you have one currently, is not a very smart option financially because they are more expensive than ITR swaps and are not as powerful. GSR swaps are easy to find and are much cheaper.

As far as swapping, they're all the same amount of work.