I used to have points replacement type fitted inside distributor until it failed on the off ramp of M40 on me 2 years ago ! Since replaced with original points which work fine although I have fitted the old fashioned Sparkrite electronic ignition that retains the points. I went down that route as went to Scotland last year and old tech. In middle of Scotland east to fix !
Having said all that I did fit Lumention to my previous Fiat X1/9 which ran perfectly for 8 years. Main reason for fitting to that car was that it was a bugger to get at the distributor so checking or changing points was not the piece of cake it is on a TR6