Fran,
my car, front travel at wheel, 2-1/2" bump and 1-1/2" droop, 4" total. 300lb spring.
rear travel at wheel, 2-3/4" bump, 1-3/4" droop, 4-1/2" total,350 spring.
I consider this a "road" setup.
the original GT40 that I measured (vintage raced) had about 1" to 1-1/2" front bump travel with about 450lb springs.
you must be asking for bump travel because your not going to change total travel with spring rate?
seem to remember ERA discusses spring rates and such on their site or in their downloadable manual.