Patches for Wb3.1 - 3.5 - 3.9
http://os.amigaworld.de/index.php?lang=enYou'll also need the latest sfs or ffs.
http://strohmayer.org/sfs/ You'll need to repartition and format the drives after the fs drivers are patched in.
I recommend that you make copies of your installation disks and patch them and not the originals.
I've used a 60 gb hd with my a600 myself.. Still i've only used about 800 mb or so.. The idefix97 software will also help unload the cpu a bit and add support for larger hd's. And a replacement Hdtoolbox tool might be needed. This is on aminet i think. Any data you write above 4gb on a stock install will get corrupted btw.
As far as accelerators go, you should try mailing
http://ami.ga and be put on the list for the new 68030 600 accelerator.
Good luck