There shouldn't be a lot of heat back there except during hard driving. The biggest thing I have noticed when exhaust exits like that is sometimes it will leave a sooty residue you have to keep cleaning. I like the idea and was thinking of something like that on my '68. The other thing I would look at while you are messing with sheetmetal is to see if you can line up the reverse light with the tip. Looks odd being offset in the pic.
Mike
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Mike Redpath
Musclerodz & Customz
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