plugs are shot craig.. i thought you werre gonna run begi and standard injectors ?? as per what i did before i got one of c2's ecu's ! the only other way to do it is to have the ecu remaped or , get a bigger flowing afm , to even it out a bit with the bigger injectors, but it wont be perfect and will still overfuel alot. i would think that standard injectors, new plugs, and the begi, along with the 255 walbro will be ok for 300 ish bhp, its just not as efficent as bigger injectors and a proper map.