It may actually depend on the SIMM you use. Amiga is a stout machine. Just try it and if it doesn't work then you will know from the fircrackers: the memory chips will explode but most likely everything else will be ok. I say that because I installed a cache memchip backwards in a PC one time and it exploded... scared the crap out of me. I'm a ballsy kind of guy though. I DO it and if it works I found something out. I don't think you're gonna hurt anything in this case. No pops... no cracks... no nothin'.
Post a reply if it works. I would also like to know what memory you used.
On the 8M simm, Try it!