B20B/Z = B20B or B20Z.

You can replace your whole stock transaxle and clutch for less then $400 if you do it yourself.

If it where up to me, I would run a B20B/Z with a 92-93 GS-R YS1 transaxle and 90-91 PR4 ECU. 90-91 B18A intake manfold. P73 pistons would also be a nice.