I serviced some local Schwan's for about 25 years that were converted to LP. One of the key things when doing a conversion is to limit the mechanical advance in the distributor to about 20° BTDC. More than that and you will see the piston problems you describe. If the air/fuel ration gets either too rich or too lean the burn time will increase and take out the valves and manifolds, pistons too in extreme cases. The fuel burn needs to be complete by about 10° ATDC. If the mixers got too much wear in them, even with computer control they would go rich at idle. If the sat and idled more than a minute or two with that rich mixture the exhaust system would start to glow red all the way from the cylinder heads to the convertor. The switch to liquid LP injection in 2000 cured most of the engine problems. It did take a few years to get the fuel system problems worked out.
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