The injectors I am using are Venom 80lb/hr (830cc/min) and will support over 800hp on this engine.  Yes, it is a bit of an overkill, but after wasting money with my 32lb/hr (325cc/min) and them being too small for 350whp, I decided to go really big, and not have to worry about fueling needs ever again.  The injectors I'm using are low impedence, but I'm using a resistor pack and run them as if they were high impedence through megasquirt.  Tuning them was a little tricky compared to the 32lbers, it puts in over twice as much fuel per millisecond.  Overall, I'm happy with my decision to go big, haven't seen any downsides yet.