id say if your going to do it. go .05 over just to clean it up and put a 4.125 crank in it and make it a 382.
i also would skip the 6.0 heads and call brian from TEA and have him set you up with a set of trick flows. they do the best job on heads i think i have ever seen. they are doing a set for me as we speek and they did my last ones as well.
go over to www.ls1tech.com and visit the forced induction section, they are up to speed. im a mod in the nitrous section, but i ran a twin turbo set up for a few years back 2001-2004 car was stock motor with a revirse split cam and t56 etc car went 10.6 @ 133 and i drove it daily!!!
now i run spray. car runs 9.7 on motor and 8.7 on 200 shot. should be faster this season.