Look at Taylor engineering website for ratios
While it's out it's a good idea to do the clutch and rear main seal. Might even be worth looking into lightening the flywheel.
Via the aussiefrogs App
the box is so close to being out it hurts. im stuck with two bolts. the 16mm under the distributer and the allan head holding the starter on where the clutch fork is. any tricks to getting these out. can't get them for the life of me.