Looking at the pictures, you have a Plus and a 68030 accelerator with FPU. The 64-pin connector on the side might be a CPU passthrough. Right number of pins. That's a Plus motherboard, and Hyperdrives for the Plus are ordinary SCSI drives mounted inside the case. The bracket held a drive, fan, and a small power supply. There was a Killy clip similar to the one on the 68000 but smaller which snapped onto the SCSI controller chip and led up to the disk drive. I don't know if the older MFM Hyperdrives would work in a Plus - they might. In any case you don't have the MFM controller board there. At least you have a very fast Mac Plus with Hyperdrive and government security labels on it, so it's cool and should impress the hoi polloi.