Generation IV Internal Engine - Just need some help with my 403 LS2

My shortblock 403 LS2 leaves from LPE today and should hit the shop on monday or tuesday. I have a redesigned cam coming, going to use my existing heads with a little rework done to them. I ordered some 42lb injectors, my questions are with the 42lb's work right away with my ls2 harnesses or do i need something else to make them work and what else do you guys think i need to upgrade or switch to for this thing to be a beast.

depneds if you got the shorties or the regular tall 42's. the older styl tall 42's wil need different pigtails and spacers for the fuel rails. If you got the shorties you will be all set.

i think they are the new style 42's the shorties, any other advice you guys could give me on upgrades you think i should look out for.