Can not kill LA......Running on

So you all know the problem is fixed & this is what is new before I found this roll pin.

New plugs(colder), leads, rotor, cap, carby rebuild, twin exhaust, radiator, radiator cap top & bottom hoses.
Also tried diffferent range of octane fuels, checked the temp with new gauge took the car for a hard run bumped the idle up to 3000 rpm, ste the timing at 10 deg BTDC & slowly poured water down the carb, not alot of stuff came out the exhaust.

Even doing the above did the problem did not go away until the pin was removed.
Thanks for your advice.