I have a stock 84 t/a 5.0 L69 with 157,000 miles. Would this engine handle nitrous and if so, how much? What else will I need to buy so nothing breaks?

Kill
Old lady in 99 Malibu

 

I would stay at or below 125HP shot of spary. As long as your ignition and fuel systems are in good working order,you don't really need anything else except a set of plug one step colder than factory. Also remember to retard your timing 1.5-2 degrees for every 50HP shot of spray.