if he did a bad job of it i would go over it and check his work, no sense getting more headaches down the road because of someone else's mistakes. if you where starting from scratch with a b-series swap you would need mounts, wiring, tranny, hydro adapter if you are using a hydro tranny, axles, shift linkage, ecu, obd0 to obd1 conversion if you want to run an obd1 ecu, may need to modify the exhaust can't remember. here is the swap guide on the forum.
http://www.crxcommunity.com/viewtopic.php?t=173
hope that helps
http://www.crxcommunity.com/viewtopic.php?t=173
hope that helps