1978 Honda Civic spark plug question

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1978 HONDA CIVIC
4 CYL
FWD
AUTOMATIC
100,000 MILES

1978 Honda Civic CVCC. My son rebuilt this car by using a shop manual. The motor looks like new. He drove the car this summer and recently developed problems. He thought he had no alternative but to buy a new carburetor. It did not solve the problem. The idle is rough and sounds like the timing is off. He checked it and the dwell, and they seem okay. The plugs have some carbon deposit on them. I wonder why the manual list two type plugs NGK BR-6ES for the standard engine and NGK B-6ES for the CVCC engine. He could not find the plug so he is using the NKG BR-6ES with the CVCC engine. Is that okay? I would like to help him figure out the problem so I started by asking you for your knowledge.

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The difference between the two types of spark plugs is very slight. The "R" in the part number signifies an internal resister inside the spark plug, which cuts down on engine noise in the radio. Your fouled plugs are probably caused by the "O" rings on the auxiliary valve housing in the cylinder head. The "O" rings can be replaced without removing the cylinder head.