...I've heard the same about platinum plugs w/ nitrous being a "no-no"
...a set of Autolite's or NGK's should be fine, maybe try one heat range colder on the 75 shot and 10 deg. initial timing w/ Premium pump gas, and tune from there.
An MSD window switch (coupled w/ a WOT switch) is a good activation setup to use for over-rev protection, especially with a manual trans. ...for either power-shifting or if you miss a gear, or bounce off the rev limiter from lack of traction on the street, for example, and still have the nitrous flowing.... BANG! I've tried a push button setup before, but I'm not coordinated enough to use one effectively
Centerforce Dual Friction setup is a good clutch... I've also heard very good things about Spec Clutches... I'd say either
And dittos to the hotter ign. system and adj. fuel press. reg.