I only have 4" of total travel on my falcon. This is only due to packaging, too much stuff under the falcon with the 3-link and watts.
I have only driven my car on the street at this point and I have not seen any major issues with limited travel. My DD 95 mustang only has 1" until bump stops and only rides hard when I have someone in the back seat.
4" of travel minimum should be fine. Do you plan on off roading . Our cars are meant to drive on asphalt. Unless you have some real big buddies that you intend on throwing in the back seat and take every where you go, as Greg Weld would say,"Fuggettaboutit"
No plans on offroading ,but even David reccomended 6" of travel as ideal and if you use c/o bumpstops you should add at least 1/2".I don't see the problem with 7" stroke shocks in any position if you aren't using factory style mounting points.I'm not saying you don't have some solid points,it is just that I'm 6'3" and weight 270# and what passes for pavement in some parts of my state are like hitting the inside corner curbs on some of the worst tracks i've seen.I was just thinking it wouldn't hurt to have a little cushion to the specs Dave quoted.
Four inches isn't enough. I agree with Dave, 6 inches gives you plenty of room to roam in extension and compression in a custom mounting application.
Throwing a set of long shocks on components that are engineered for a shorter shock isn't a good idea. You must mock things up and modify to make it work.
I'm in mock up stage (or starting as of last month) and the whole rear frame is being handbuilt by a friend of mine and myself,so we can tweak things here and there.I may be wrong (wouldn't be thefirst time),but aren't the rear shocks or c/o usually of a longer travel than the front?I would like to get the max out of both ends within reason.Don't want to open too many cans of worms at one time,but want to consider both ends and make the wisest decisions that I can make.I don't think 4" is enough personally at either end.I would prefer at least 5" in front if possible.I don't want to step on anyones toes,but with channeling the body and reworking some of the shock mounts for adjustabity I could have enough compliance to get through some of the parking lot ramps around town cuz i intend to drive the crap out of it when It is running.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
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. Our cars are meant to drive on asphalt. Unless you have some real big buddies that you intend on throwing in the back seat and take every where you go, as Greg Weld would say,"Fuggettaboutit" 
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