Actually Dan, the B2000 only had mechanical rockers......there is a threaded stud in the end of the rocker arm and it has a 12mm "jamb nut" that locks the threaded insert in position once you have the valve lash set to the specified tolerance.
So, the B2000 engine really doesn't have a "lifter" so to speak.
The B2200 engine has the Hydraulic Lash Adjusters (HLA's) in place instead of the threaded stud and jamb nut. A lot of members will replace the B2200 HLA rocker arms in their 2.2 engines with the earlier B2000 mechanical style rocker arms when they start experiencing the dreaded "tick-tick-tick" of the worn out HLA's.
Mechanical rocker arms and they're related valvetrain (like the camshaft!) are actually a very desirable item to have, so I wouldn't change from mechanical rockers to hydraulic rockers.......I would do the opposite!
Here is a pic of the last engine I put together and it is a 2.2 (B2200 engine) with mechanical valvetrain from a 2.0 (B2000 engine) including the "mechanical styled" camshaft.