nitrous or no nitrous

ok guys i have an extra bit of money and lookin to put on some nitrous oxide on my dart. im lookin to get just a bit more umph from it... dont know how much i should go though ive heard i could go 40% of stock power..im thinkin i might be able to get away w/ 100 shot what do u guys think.. my engine is
360 standard bore
cast pistons
torker intake
eddy 750
headers
.509 282 duration cam
360 j heads 1.88 1.60 valves..