nitrous on a big block

[bel_mor]

have been thinking of buying a nitrous kit for awhile. but having an engine with mostly stock parts (ie. cast crank, stock rods, factory forged pistons.)I am a bit nervous as to how much (if any) of nitrous I can safely use with out any catastrophic failures. The engine is a 402 it has stock heads(299241 i believe) and stock bottom end it has 10.5:1 compression it has a comp cam 288ar solid roller camshaft. the car runs 12.40's in the 1\4 mile on a mt 26x8.5 drag slick. would like to get it into the high to mid 11's if possible. any input would be great