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The CR plugs are commercial grade and have a thicker electrode and ground. It's also a slightly hotter plug than the R.
Basically a heavy duty plug used much in GM small block TBI trucks and other GM vehicles. I think they used them in some Corvettes as well.
0.035 inches for CR43TS or R43TS AC Delco spark plugs
That car didn't come with a 350. The V8 available for that Monte Carlo was the 305 which took the ACDelco R43TS spark plug.