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Euro 3.2 sparkplug specification

Engine

Model: Carrera, Year:1984, Mileage:130,00, Type of use:Both Street & Track
Recently tuned my 1984 ROW Carrera 3.2 with Autothority mass air flow and chip, enlarged throttle body, and B&B exhaust. I am unable to find the proper spec for the spark plugs as all the parts houses only list the US cars. I understand this motor uses different pistons and if the wrong plug is used (i.e. US car spec), damage could occur as some plugs may have too much reach possibly causing contact. I removed Bosch Platinum #WR4CP units, but Bosch doesn't make them any longer, and can't give me an alternate. I ended up installing NGK #BPR6ES because they matched desired reach, but driveability smoothness has suffered especially during warmup. Can you tell me what plug and gap is specified for this engine? Any help appreciated.

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