If I were you I would say sod the grief, check out the wiring diagram and reinstate the original wiring an d then fit a Dyna-S ignition system which can be bought for aboiut sixty quids from Z1 Enterprises. Very reliable folk and delivery much quicker than you'd think (or they pesimistically promise!). There's a link to their site under links.
Whilst you could spend hours firkin about I consider sixty squids a worthwhile investment for hassle free sparks. You can spend a shit load o wedge on fancy shit with poncy coils and plugs. Junk the NGKs if you've got them - cos their shite (these days) and get some Nippon Denso's from
http://www.spark-plugs.co.uk/index.htm where they're 'bout a quid a plug so you may as well get a couple o sets and have a set ready for ... dunno actually cos they're sooo reliable - I gotr two cos they were sooo cheap and I luv a bargain
