I came across two nice guides if you are interested in swapping a K20/K24 motor into your Civic or Integra.
This guide gives a checklist of every part you will need to complete the swap.
http://promotiveconcepts.com/blogs/news/14869827-honda-and-acura-k20-k24-k-series-complete-engine-swap-guide
This guide is more detailed and also shows how to complete the swap as cheap as possible.
http://www.importtuner.com/tech/1406_budget_k_series_swap/hasport_mounts.html
I will also start a swap guide page. You can find it in the top of the sit under the main menu.