Stock ICM is more than enough for your needs, thats something that can really never be upgraded anyway.
Stock coil packs are hands down the best out there, MSD makes complete **** so don't buy them. A good copper spark plug with 2-3 heat ranges cooler than stock should be good. Figure 104's or 103's (autolite brand).
I don't know what fuel injectors the 3100's have stock, if they like the 3800's then I'd go with some 60 lbs injectors.
I bet 9-11lbs of boost on a turbo will make more than 330whp too. Turbo's are soo good at making power. Different platform here but some of the LS guys with bone stock 5.3's are going from 250-280whp stock to 400-450 to the tire on just a lower boost turbo system.
