You might find some nozzles, do the swap yourself, and get them pop tested locally for under $600... but prolly not whole injectors.

Set your backdown and alarms on your edge box. I have an edge with the HOT Juice. I ran some OLD Mach3's (~120hp) ( I paid $100 for them used btw) for a few hundred miles with basically your same setup. I ended up having to take them off b/c the smoke and EGT's were just too crazy. I could hit 1600* with the box on kill. I have a LIGHTLY massaged WH1C charger.

I think you're gonna have problems with what you're doing unless you can get a bigger huffer to move some more air.

Short bursts of high temp (second or two) you'll be okay. Don't sustain it or you'll have ice cream cones for #5 and #6 pistons.