well if u want NA then u can drop a stock B20Z in there with a cable LS tranny and call it a day .. maybe with LS OBD-0 ECU/distributor/injectors
it should be great, last longer than it will in a CRV and be nice and torquey
but if u do want turbo then B20B is better due to lower compression..
low revving turbo b20b with a tall geared tranny/17" wheels seems like it would be kinda fun to drive on the street =)
ive heard that the stock 84mm bore honda sleeve is pretty weak tho and easily broken ..