btw. can you use HFS+ with OS 7.0?
To my knowledge, Mac OS versions that predate 8.1 cannot write or access or even see files in an HFS+ partition. In fact, that is the "only real reason" that 68k Mac users might want to stick with 8.1 instead of 7.5.5. Although even 8.1, on 68k, can't boot from an HFS+ partition. (8.1 PowerPC can.)
On an offtopic side-note, the reason I bring up 7.5.5 instead of 7.6, 7.6.1, 8.0 and 8.1 is because it has full MFS support and can still be run in 24-bit mode on compatible machines (good for even greater software compatibility). For full MFS support, 7.6 could still be considered, but on top of lacking 24-bit mode, it accidentally rolls back a bugfix. 7.6.1 addresses the accidental rollback, but then also chops off some of the MFS support. Either 8.0 or 8.1 removed MFS support fully.