some msd/o2 sensor experience needed

410 stroker 73 duster for 90% dragstrip use. Wondering what direct dragstrip results you had going from stock to msd ignition ? And i seen some kind of o2 sensor gadget at the parts store today . So far I've been using the old school - "the plugs look good" and " it runs good" for tuning the dual carbs. Any dragstrip experience with an o2 setup and what one ? Thank you . .....