I have a 1976 FJ40 that has a build date of 9/75. These two years had vacuum retard canisters on the distributor ( instead of vacuum advance) from the factory. The ignition at this point in time was moving to total electronic. They had a "box" but the distributor still had points. I have the factory Toyota manuals that give no explanation of why these two years came with the vacuum retard canisters. Is there any Toyota technician with intimate knowledge of why? Was this to pull timing advance out of the ignition for some reason? Were the centrifugal weights over-advancing the timing and this was an easy fix? "Splane Lucy" share your knowledge please.