H23 Swap

Ok I'm going to buy a wreck 93 prelude with a H23 for $400 tomorrow. What excatly do I need for a swap into a 90 accord ex 5spd besides the basic engine& ecu?
Do I even need to change the tranny, I know it would be best but do I need to?
And is the wiring hard cause I heard that the 90-91 were alittle diffrent?
Thanks for the help!

you dont need to swap trans but you might as well bc the h23 trans is a shorter gearing as far as wiring you can use your stock harness but jsut lenghen a few wires