My LC III has a Sanyo Pico Ace 15 60x60x15mm fan, with two wires (1 blue, 1 red) going into a 3 pin connector. Most replacement fans you find will be 60x60x20, so they won't fit correctly.

Forget the hard drive or power supply, have you checked out the '030??? I had mine running a few days ago with the top off, and i just *lightly touched* the top of the 68030 (I know, I know) and it almost burned me instantly! With no heat sink, those things get HOT!

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Well, one way of solving this is to install a chipset heatsink, one that isn't too tall so that it fits in the case. They can be mounted to the chip using 3M thermal adhesive tape. This creates a bonding between the chip and the heatsink, sort of an alternative to thermal paste/grease.