This subject often comes up. Those upgrades are hard on the aging under-rated components as it is, so removing the upgrade is probably the best thing to do, unless you risk lifting traces or otherwise damaging the board. I'm not familiar with that particular upgrade. However, most of these upgrades require 512K base RAM on the board, so even with 64K ROMs it will not exactly be "stock". Although, if the board is providing the extra RAM decoding, the Mac may only recognize 128K on its own. And depending on how that add-on board is connected to the logicboard, key chips may be missing and have to be replaced. Take some pictures ...