what size injectors
 

i have 380 hp plus a 150 shot and plan on upgrading the heads and cam later what injectors would be good and what hp are the stock injectors rated at.

Stock 26's are maxed out stock pretty much. 28's "can" be ok to 300rwkw, but only just. SVO 30's are a good choice Id say. But with Cam Heads and NOS you might want to look at the 42's.
If you do a search on google there are sizing calculators based on engine bhp & BSFC which will tell you what lb rating to get.
Here is a good one http://www.rceng.com/technical.htm

I dont know what the stockers are good too, but you may want to go with an injector that is bigger than you need. I went with the 45's and they are way maxed out at 600hp and now I've got to upgrade again for more boost later. Since you have nitrous, I'd get the biggest possible so you won't have to buy the same part twice....that is if you want to go with a bigger shot later. I know I would lol... Just my 02.