Ken,
Mr. Butler had some interesting things to say about the Lightweights. My memory could be faulty, but if I recall correctly, Mr. Butler told me the only fiberglass part on the '64 Lightweights was the hood. The bumpers, fenders, etc. were stock. Instead, Ford saved weight by building the racers on a Galaxie 300 frame, lighter than the more robust 500 frame. I see the 1964 LW as much evolved from the '63, since they were built literally from the frame up as lightweight dragsters. And I'm sure this experience helped Ford craft the Thunderbolt as well.

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Freedom and whisky gang thegither/
Tak\' off your dram!