Both the #6 and #1 plug work exactly the same for setting timing.
Using the #6 plug is easier since it's on the same side of the engine as the timing marker on the front cover, less chance of getting the timing light wires tangled in the fan or belts.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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