Les, I agree with the others. I used the OEM kit from Moss, and was very pleased with the quality. The molded transmission tunnel is a definite MUST. The tunnel piece is molded with stiff felt, and the footwell and battery compartment cover pieces are also very nicely padded. This kit also has molded rear wheel arch pieces, another must.
I insulated everything I could, using the "space age" insulation sold by Moss. (JC Whitney sells the same stuff, cheaper, I found out later.) The insulation (foil side installed TOWARD the heat source) made a tremendous difference in my car, especially on the tranny tunnel, on firewalls, and in footwells. Quieter and much, much cooler in the summer.
I've got pieces of the insulation left over, and plan to put some inside my doors and behind the trunk wall vinyl trim piece (above the battery comparment) when I get to working on the B in early spring. The carpet/insulation project was a lot of fun, and I am very pleased with the results.
I also put down a sound deadener kit from the British Heritage Trust (also sold by Moss.) Kind of pricey, but I've since discovered you can do the job with a superior asphalt-based sound deadener from McMaster-Carr. (You just have to cut the stuff to fit yourself)
To see photos of some of the carpet pieces and the insulation, go to my Ofoto album:
66B interior project photos
(You have to register to view it, but it's free.) If you can navigate from there to my other albums, there's another one showing the interior project results...
Hope that helps!