b20a??

i have a 1989 honda accord lxi and ive been reasearching the motors that i could swap into this car to replace the a20a3. the only one i found info on that would be a direct swap using the same motor and tranny mount is the b20a motor that came in the 3rd gen accords in japan. its a dohc and comes with 160hp stock with the goldtop and 145 with the blacktop. ive looked everywhere on the internet and cant find a website that sells this motor. can anyone help and give any info on this?????