@bomrat:
If you have an older A2000, you will have to make sure the 68000 is removed from the motherboard, but if it is a newer so called B2000 (rev 6.x), the 68000 needs to be mounted on the motherboard.
Here can you find information about A2000 revisions and
here can you find information about how the GVP card should be jumpered.
/Patrik