You aren't allowed to do 106 mph, so I'd say the tubed tyres will be more than fine at 70. Those journalists in 1975 mostly survived. The ratings obviously involve a tolerance in addition, you won't find all four go bang the second you hit 106.1. Ever seen a Hayabusa tyre that's done 200 or even race tyres on after the race? Serviceable if you need to pop out for pizza but never going to pass an MOT.
Your risk is legal assuming the car will do 107, which is a PITA. My CL350 insurers don't really seem to care that much about this stuff though, certainly not like the modern bike insurers who'll count E5 98 octane as a performance mod.
I was using one of my film cameras (Zorki, the 35mm equivalent of a Ural) on Saturday.
Carbs I'm fine with on a Sunday afternoon. Rush hour on a Tuesday I'll take FI.
Carbide lamps are probably better that Mr. Honda's LED's
Andy
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