What would be the best modifications to my 1992 GT convertible to make highway travel more comfortable? I will be driving quite frequently between New Orleans and Houston (350 mi, 6 hours) and I would like to arrive without being beaten up.
My car has 91K miles with the following modifications: subframe connectors, 3.55 gears, Pro-5.0 shifter, battery relocated to the trunk, CD player and new speakers, new mufflers, and strut tower brace.
Because of the heat and humidity, I cannot use underdrive pulleys and because the roads are so bad (and they flood), I cannot lower the car.
For example, would progressive rate springs help? other shocks or struts? change in the steering column to reduce vibration? additional insulation to reduce noise? x-pipe to reduce cruising drone?
Thanks.