How do you determine "ride height" to make suspension mods??

Well intended use is going to a driver that handles like a new car. Something that I can get in and be comfortable enough to driver in the say the Pour Tour if I wanted to. Car will have the creature comforts. AC, plenty of sound deadening, Alter K front end, custom tri 4 link out back, large rim tires, "Pro Touring" car. 4sp GM OD trans, stroker 340 motor, big disc brakes all around. Will probably only go to the track once a year to hang out with my buddies who drag race, but I plan to drive the 1.5 hours there and back. No trailer queen here. So the intended use would be for a serious cruiser for long rides yet handles and hugs the country curvy roads, and yet won't bottom out on the hilly roads of Western PA. So I obviously can't slam it to the ground.

Does this help any??
Yes it does a bit But you have to remember most coil over shocks are only built for 4-5 inches of travel so you can use that to help determine ride height a bit. The AlterK is an awesome set-up and should do really well for your intended use. I would also look at the RMS Street Linx for the rear they have done a ton of work and it will save you a ton of headaches. If I had the money I would have done the same kit But I had to work on a budget so I built my own rear suspension and I have a friend that owns a fab shop that is building my front K-member and suspension for me( see my thread about it in the suspension forum) But going low also improves handling by lowering the center of gravity (illinois roads are horrible and I'm going really low) because I am doing the same thing I want modern car handling in a classic car body. Look at the US Car-tool sub frame connectors too the really tighten up the chassis I can lift the whole side of the car by the rear frame rail now.