two things first OD on a acoustic guitar... You'll need to run it through an amp.. if running through a DI to a desk it's gonna sound horrible. You might wanna think of investing in a magnetic pup that runs across your sound hole to avoid feedback aswell. The LR Baggs M80 is quite the nice option...
Then that pedal... Try and get a vintage Japanese Boss SD-1 the new ones are not nice... you can however do a mod on the new one's for the vintage tone.
With this setup you are on your way to that acoustic drive tone of John Butler Fame.
Good Luck.