Steve,
        Along with removing the oil pan, disassemble your distributor.  It is 
likely an object like a nut or washer dropped down into the lower portion of 
the distributor casting and jammed between the advance counterweights and the 
casting: sometimes the distributor explodes...sometimes it is the 
gears...sometimes only the driving dog or the split pin sheers.  I have 
worked on hundreds of English cars, and the experience you describe is 
identical to three others I have seen: the last person doing a tune-up 
dropped a nut while changing the points...oh well!
Jim Leach,	Seattle
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