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I don't know if this has anything to do with "body vibrations" at speed due to air being forced around gaps in fit in the firewall or around the body, but here is what I did.
I used "spray insulating foam" from Home depot (about $5.00 a can) to seal up between the body and the area near the exhaust headers and the sidepipes. I had a lot of heat coming through into the foot box, this fix it perfectly. A little of this stuff will seal up just about anthing else you need to seal, especially if it's in a difficult place to get at.
Anyway it's worth a shot, Bill
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