Nitrous on a stock Chevy 350?

I have a 350 everything stock except for the cam and its a mild cam. I am running a SNIPER Nitrous System from NOS i have the 125 shot in it right now and have been running it with no problems. On a 125 shot i am taking 4 degrees of timing out of the engine..I am wanting to try the 150 shot and was wondering if it would be okay on that engine without hurting it and would i need to take out another 2 degress of timing out of the engine which would be a total of 6 degrees..They say for every 50 shot of nitrous you should take 2 degrees of timing out.
 
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