If it was free or extremely cheap, sure why not.
If you had some cash to burn on this, go with (my personal favorite) the Warp Engine 3040, or the Cyberstorms.
The fast local memory, FAST SCSI, and 040 or 060 make a 3k perform at a very usable (relatively speaking) level. It will behave like a new machine, where a a3640 will not be noticeable for most daily functions over the 3640.
Good luck!