This engine does NOT have a ratcheting tensioner.

If the head has never been off before, you should be safe reusing the head bolts, I'm assuming you know to angle torque them. You can measure the headbolts if the head has been off before, or if you're not sure. As long as they're not stretched beyound spec, reusing them is no problem.

Two days should be plenty of time as long as you have the replacement head ready to go back on.

Good luck,