The trans will"fit" but will not be "clocked" right.Also,if A/C is in your future you will have a nightmare fitting the compressor.I was going to do a KA-24 into a 620 and gave up when the A/C compressor wouldn't clear the steering box.(Both the KA-24 and the Z-24 sit vertically as opposed to the"lean" of the L-20.
Looks like i'm going to do a 2200 cc stroker based on the L motor instead.:)