You really dont need to get upgraded injectors. (Unless you go big turbo)
Fuel pump yes... Depending on which system and what amount of meth your injecting, your duty cycle on your injectors should be below 90%.
I would also strongly suggest doing a 50/50 mixture. You "CAN" obtain more power and TQ with lower egt's and injector dutycycle than a 100% meth mixture. All depends on what kit and whos tuning.
Also for kit, dont go cheap get the best... Aquamist! You wouldnt buy a ebay rebuild motor from a unkown builder right? You would buy a Jackson, Buschur, AMS or any well know built motor proven to work. Aquamist has been doin this the longest had have the best kits bar none! There price proves to show its worth.
Good Luck
Evan Smith