is this a good cam for NA and N2O ???

[ff_jeff]

To get the most out of the nitrous, you want to keep as much of it in the cylinder as you can. To do this, you need a wide LSA. 118.5 is very wide!

For a naturally aspirated cam, you want a much tighter LSA.

Since it isn't a daily driver, I would not hesitate to go with at least a 3600 stall and 4.56 gears (since most trucks have relatively tall tires.) For a stock head 5.3L non-daily driver that wants to occasionally spray, consider something with the intake duration around 220 degrees and an exhaust duration over 230.

This would work very well. LS1-GT7 208 / 230 .554" / .546" 1.7 ratio 121 LSA
The Thunder Racing TR Blower cam or CheaTR or LS2 CheaTR would work well also.

Another thing to keep in mind is when you spray, you want as little backpressure in the exhaust as possible. IF you put a high flow exhaust on, you could see like 20hp more with nitrous than a less free flow system. Here is a link on a good read Nitrous Tuning Tactics - Popular Hot Rodding Magazine