which should come first in the fuel system build up? i already have a mid-size cam and im going to run a wee shot of nitro on top of that, would i be alright with a pressure regulator and injectors, or bump up the stocker duty cycle and throw a walbro 255 at it?

 

1st comes pump, then comes injectors. You gotta supply the injectors w/ fuel 1st to run bigger injectors.
Especially if you run a wet kit. Your stock pump wont keep up.
If you run a dry, I would look into some bigger injectors in the near future, but why go dry.
The wetter the better

 

so a bigger pump on stock injectors would yield results on a dyno?

 

It shouldn't because you are still supplying the same pressure from the regulator to the injectors and the injectors can only supply what they are rated at.