John,
I have been running a Mallory twin point distributor in my 400 for 30 years without a problem . I can not remember but maybe one set of twin points in that time & parts are readily available from most spare parts shops. They are very reliable probably more so than a ECU .
I fitted a second hand Mallory to a friends 403 which he did not touch (even remove the cap ) for about 15 years and about 60,000 miles .
The advance curves of these Mallory distributors are fully adjustable and the twin points gives a greater dwell angle and better spark . I have tested them to 7000 rpm without any variation of the spark .
Most Lucas distributors (even new ones) on the same testing machine show points bounce between 3500 - 5000 rpm . They are very erratic and poorly made .
Geoff
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