ride height info wanted

[Eric Seppanen]

OK, so I've got my first set of coilovers in the car, and I'm interested
in a reference point as I set my ride height.  Does anyone know what the
distance is from wheel center to top of wheel arch (measured like this:
http://www.spikeengineering.com/lightning/rearht.jpg ).  I have a 92
Sentra SE-R.

This is a rally car, so I'm going up, not down. (need ground clearance)
I don't have any regular-sized tires around, and it's been years since
I've had any street suspension on the car, so I have very little idea
how high the car originally sat.

Eric