I'd try seating the valve deeper and using adjustable lifters.Inserts as a last resort, I've had them installed in OHV heads and found them rolling around in the truck box on the way home!If the engine isn't designed for them, there's not usually enough metal left to retain them properly.Your early thick-wall Ford would probably be ok. At least on a flattie a loose insert doesn't mix up with the piston, so you can limp home.
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