HELP 67 Pontiac Tempest 326 won't start
In your attached picture, two of the distributors are clockwise and two counterclockwise. Yours should be counterclockwise. Same for Olds. Opposite for Chevy.
As to your question, 180 from 1 is number 6. What you can do is manual rotate the engine until the rotor is at 1 and the timing marks are aligned. You could use a sharpie to mark where on the distributor your rotor is pointing and the position of the distributor in relation to the motor. Then rotate the engine one revolution until the timing marks are aligned again. Now your rotor is at 6. Pull the distributor just enough to clear the gears and restab with the rotor pointing at 1. Set the timing and fire it up.
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1965 Pontiac Tempest Custom - 326 bone stock