What is the correct fan to radiator clearance?

jawbone said

Now if I could get my new voltage limiter working again. The ground screw on the instrument cluster is stripped

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probably should start a different thread.
Explain what you mean by ground screw.
This is the similar '67 Rally dash. Each of the illumination lamps has a ground to the casting.
The casting had a supplementary ground wire that attached to the dash panel where the radio support mounts.


I expect '68 is similar.