OK, so I guess I would just follow the instructions for the A500 then? (The problem is that there is a wire jumper that hooks up to Gary chip -- concerns me.) I really want the 1.3 option so that I can be fully compatible with old games on disk. What type of reliable softkick options are there? I know nothing about doing a softkick. Maybe I should try that before deciding whether to do the hardware surgery.
Pin 41 on Gary is the reset line (_RST). You can use pin 40 on Gayle or pin 20 on the 68000 (or several other places, check an A600 schematic for other locations) for the same thing.