Just follow the timing procedure in your '69 service manual.
The '69 TDC mark on the Cam Sprocket was relocated to the bottom of the sprocket. '66-'68 is on top.
As far as belt tension, no "special" tool is needed. I do all mine by hand.
I'm not sure about '69 but the front cover backing plate on the '66-'67 has lines used to set tension. (See Left side)
As long as the deflection falls within these lines you're good to go.
Disregard the factory timing specs with today's gas most of us are running at 10/13 BTDC on timing and it makes a world of difference.
Cheers.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car.
