1. They will be stiffer
2. How much they "raise" the bike depends on how "worn out"/sag you have w/your current fork springs.
A rule of thumb is around 1 1/2"s.
FYI, many have tried "stiffer" springs and have returned to the OEM's.
I would love to find a way to soften up the first few inches of my front end, if jars pretty hard on shose small sharp bumps that our highway department seems to think are mandatory around here. I have progressive shocks on the rear of the Trike and they work well if they are kept with enough air so they are near the top of thier range most of the time.
Before I had the forks rebuilt, I was really feeling those bumps and holes in the road when the front tire would hit them! The Progressive springs have really taken away that jarring, thumping feeling.