I own a restoration shop in the Midwest. I have converted dozens of my clients cars to DOT5 with NO issues. DOT3 is Hygroscopic & pulls moisture from the air. DOT5 repels moisture being silicone based. When DOT3 reaches it's saturation point the water settles out, mostly in the wheel...
I have a restoration shop & work on all makes & models. Have had both good & bad results from Classic Industries. Bought replacement gauges (temp, fuel, amp) for a 69 Road Runner. I was boxed wrong (got 2 temp gauges), but they DID expedite a replacement, which was the right thing to do.
Both...