Installed new stroker, won't run right, Help!!

[Blaster]

Code 31 came up, I think it had to do with the EGR, nothin too serious though. It is harder to start though, is it normal to have to give the car a little gas to start it with a larger engine??? I though the fuel injection should be able to compensate even for the 331?? Maybe I need more timing and less fuel pressure??? Current is 13 degrees and 43psi. I'm thinking some dyno tuning will really help me out because I took my old chip out for now via my tuner's recommendation.