What part of the style do you mean? The 3.8 and 4.6 were both used in the previous generation. Infact the chassis was pretty much the same and most parts interchange 79-04. It's one of the reason Foxbody guys will utilize suspension components from the new body style and some convert their interior as well.
If you take both platforms performance wise-GP hands down even if its FWD. easier to mod and cheaper to make faster.