[ultraflo]

You can get away with 12-14 degrees and premium pump gas with a 75 shot, and one heat range colder on the plugs... if you still run the stock iron heads, then it'd be an Autolite 24 or equivalent.... gap 'em at .035 of course. Start w/ 900 psi bottle pressure.

I don't prefer/recommend platinum plugs for use with nitrous... the Autolite Racing plug is good, as well as NGK's, either will do. Actually, a plain-jane Autolite or NGK plug will do the job just fine.

10 degrees is an excellent starting point and is playing safe... however, through tuning, good note taking, and making one small change at a time, you will net some good ET improvements and learn what your combo does/doesn't like...