I spent about $100 on a used Fastlane for the 64MB RAM it would hold. 30pin SIMMs, yes, but they're not that expensive. I bought a lot of 'em for about $5 and fully populated it to 64MB. 'Course the SCSI part of it may never work right on the A3000, but the memory works fine
Try 256 MB of 32 mb 30-pin simms

Also, you may need either and/or the following to get the SCSI-II controller to work on a 3000.
New SCSI chip? New boot roms on Fastlane board. (and possibly in conjunction with) New Buster Chip Revision 11.
Rev 9 simply will not work at all with the Fastlane from everything I've read.
Not sure, I think the DMAC may have a problem with it? Unsure or maybe that's only the 3640 card. (DMAC is really the A3000's native scsi controller)
You ever want to "lose" that Fastlane, let me know