If you are looking for a product that is easy to install, and provides a good mixture of thermal insulation, and sound absorption and panel deadening, Thinsulate bonded with 3M 90 insulation is hard to beat. As a plus it meets the federal standard for flammability in vehicles. Obviously it is not suitable for floors. On floors a closed cell foam covered with a plywood layer is a good compromise. Adding a layer of mass loaded vinyl above the foam is even better, but its heavy and adds cost. Thinsulate can be cut into strips and pulled through the body structure for additional insulation value.
Focusing on the firewall and doghouse will make the biggest difference in engine noise. Using thinsualte or similar absorber (closed cell foam for example), followed by mass loaded vinyl will make a huge difference.
On the high top you have a few options. I would suggest bonding rigid foam to all the flat areas. do the curved sections in a softer closed cell foam of the same thickness. Make a headliner using vinyl or headliner fabric (foam backed is nice). Depending on your curves, you could also use some flexible panels. Coroplast, 2-3mm plywood, or plastic sheets would work well. I would suggest 1.5-2" of insulation on the pop top if possible. You may find it easier to put furing strips on the top, and attach the roof panels to them. The space between can be filled with insulation.
Neoprene sheets (1/2-1" thick) check foambymail.com, can be used for sound dampening and insulation. They work well under factory carpet, and can be easily glued to the inside door sheetmetal. They don't readily absorb water, and are easy to work with.
Don't waste your time with constrained layer dampers on everything. They only work on large flat-ish panels. On these surfaces only 25% coverage is needed. Curved panels, or those which are already stiff, don't need it. On these types of surfaces bonding a foam covered with a heavier layer (MLV, carpet, headliner etc) will provide the most benefit. The foam absorbs sound and isolates the top layer. The heavier top layer reflects the sound back down.