ls7 heads

I have a 427 LPE set up in my 04 GTO. It's good but I also have a 65 GTO that I'm doing a Morrison chassis and late model suspension on. I think I'm going to TT the 65 with another 427 LS I have but want some advise on weather to put the ls7 heads and manifold on the 04 and the LPE ls6 ported version with TT on the 65. The 04 is a daily driver and the 65 will be a resto blow the mind kinda deal. Will the LS7 heads and manifold help the normally aspporated 427 more than the TT 427? I understand the 2 V's ( volume and volocity) but just want some input and opinion as to where the LS7 heads would do the most good. Thanks G'pa:brick: