CRX motor swap

i have a friend with a 89 crx dx who is looking to do a motor swap, but doesnt want to spend a lot for a b16. does anyone have any suggestions on a good d-series motor that would fit nice?

ZC would be nice and easy.

the d16z6 or sohc vtech worked good for me i paid 500 for engine and ecu then just changed the side mount bracket from the old engine the tranny will worck but i recomend a si tranny much better then you just buy a jumper for the ecu about 70 bucks but comes with instructions then your all set and you dont get the hassle of putting in a dohc same hp and its well known in the aftermarket world i put headers and intake on mine and just leave zc's in the dust imagine more upgrades

what is a jumper??? do u have too change the crx from obd0 to obd 1??