I did the TFI (ford) upgrade. Runs great! I think that there is a voltage to spark difference between the two , TFI and HEI, HEI having higher voltages. I have the 8mm spark plug wires on the TFI setup....if I went HEI I would make sure that I only used 8mm spark wires. I believe, not sure, that TFI is around 35000 volts and HEI is around 50k, whereas stock is 20K. The main advantage of both HEI and TFI is the larger distributor which stops crossfiring of spark plug wires at higher RPM's. If you compare these setups with the stock jeep distributor cap, there is some difference in size.
The main reason I did not go HEI is I did not see any name brand HEI setups, ie....Mallory, (did not trust the ebay HEI setups) and the TFI parts can be had at any local parts store for tune up's..... and.......TFI was cheaper.
jus my .02....hope this helps out.
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