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New plug/coil wires.  NOT champion red ones they are useless.  
Genuine black ones are pretty damn good in the wet, yellow Silicone Bougicords are also great.(Ed)

High power coil.

Plugs gapped right.

Transistor assisted ignition.(Electronic Ignition)

Large piece of plastic over the radiator grille to keep the water out of the radiator when bow-waving.

Tie up the viscous unit so the fan doesn't rotate, or disconnect if electric.  You won't overheat too quickly.  This makes a hell of a lot of difference.

Condom over the coil, tie wrapped to the leads.

Rubber glove over the distributor, 2 wires per finger with the exception of the coil lead.  Zip tied around base of distributor and leads.

Copious quantities of WD40/Q20/DWF/Silicone spray inside everything.

Oh and raised axle breathers.  And wading plugs in.  LT95 leaks water in slowly to the bellhousing whatever you do so make sure you take the wading plug out ASAP.

Most important...  Keep that (sensible) bow wave going.
No splashes.  Gently gently.  Extra Q20. Make sure a companion is there to pull you out when you drown it.  

Oh and practice makes perfect.  Particularly when you are draining the oil for the umpteenth time!

- Andy Grafton