Pat, here's a suggestion: before you install the headliner, get some of the foil backed fiberglass insulation HVAC folks use on ductwork. Add a layer of that between the roof and the headliner. Use double sided tape to hold it as you install the headliner or you can use a bit of high quality masking tape (3M). On the sides, you can use a double layer of insulation usually. There is more room over there. It will reduce temperature plus it will greatly reduce noise up there. Also if you use the fiberboard type headliner, it seems to help keep it from changing shape over time. Good luck!

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end