remove the #1 sparkplug
hold your finger over the plug hole and bump the engine over till you start to feel the compression start to force its way out of the plug hole.
THEN....
look at the harmonic balancer or pulley on the crank and watch for the timing indicator, and by hand you can turn the engine till the timingmark lines up with the indicator on the front cover, this should be TDC. You can then look at the distributor and see where the rotor is pointing to the #1 plug wire.

I would also take note of rotation of the rotor to make sure if its counter clockwise rotation or not.
You can then decide on the order of fire when putting on plug wires.

this method is tried and true and there is no guessing at it