Get 60 or 80's inj.. 255lph might be enough but I would go with the 340lph close in price.. With the 10.5 comp ratio I would get heads that will lower it just a bit..
yeah for those types of goals you will probably need 60# injectors, and I agree w/ rz I dont know if a single 255 will be enough. Definitely look into the specs for a comp 270 as well, would hate to see you do the work twice and get a n/a cam that absolutely kills it when you go boost