BPR6ES
Hmmm...... those are resistor plugs - a built-in resistor in them, probably about 15k ohms.
Before using them check if you can use resistor PLUG LEADS as well as resistor plugs.
My view would be to avoid them in favour of the BP6ES or BP6EC plug type.
Too much resistance (it would be doubled) can lead to the failure of the high tension insulation especially in the distributor cap, rotor arm, king lead and coil head.
You don't need that sort of trouble.
CharlesY