What dizzy?

and

where's it get its vacuum signal?

If it was me, I'd be lazy and run the colder plugs.

More methodical people would retard the timing a bit, then
use more vacuum advance to vary the timing more so that it
won't ping under load...

Honestly, the plug is a tiny part of the combustion chamber,
so I'd just go with the cooler plug...

t
_________________
I have a car disease. There is no cure.
I'm not even managing the symptoms very well...