Floor pans in early Mustangs are notorios for rust due to leaking cowl vents. Get under the car with a small screwdriver and poke around the floor pans. If you're lucky, there won't be any, but often there is. Also run some water down into the cowl vent and then check your carpet for wetness. They do make repair kits for leaky cowl vents. They also make floor pan replacements. I've never done it' but I'll bet it's a pain.
Rev
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'66 Coupe, 306, 300 HP, C-4, 13.97 e.t., 100.3 mph
1/4 mi.
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