TR6 coil

["G Spencer" <graham_spens@hotmail.com>]

What's the difference between the later "resistor" coil and the earlier 
coil?  When I did my engine swap, I put the coil and resistor form my old 
engine on the new one, because I also mover the distributor.  The engine 
however is of the earlier type, so what happens if I put a no resistor coil 
on?  Will I blow something up?  What is the reason for the resistor? 
Ignition?  Dizzy?
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