The main problem with the amplifiers are those that are attached to the distributor like on the earlier 3.9 discos. Those engines that have the ignition modules remote from the heat of the distributer etc in the valley of the V seem to last OK. If you have a remote system then original should be OK just don't buy it from a stealer. Mine was constantly failing until I moved it off the distributor to the front of the car near the coil then no more failures.
Gazzz
REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
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