1974 D300 360 fresh rebuild will not start

Cam at 6 and crank at 12 will be timed on #6. (Easier to line up because the marks are close together) Turn 1 full revolution and it will be at 12 on the cam and 12 on the crank timed on #1.( Cam turns once to the cranks twice)

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This is exactly correct. ^^^^^