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What you've got is either a B20E or a B20F. The B20E has a higher CR and therefore more bhp. Externally they are almost the same, yet there is a small difference when you look at the middle head bolt on the manifold side. If it is on it's own island, it's an E. If the raised portion extends to the head bolt ahead of it, it's an F.
Trigger points are double contacts for the injection fuel system engine and they are in the lower part of the original E/F distributor.
The B20A distributor on my B20F is of the vacuum advance type and has the number 0231 146077. Hope this helps.
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