I’ve built a bunch of cars, all makes, all levels of performance. The ONE single modification that will always make you drive your car more and enjoy driving it will be an overdrive transmission. I’ve never once regretted the cost. It’s been worth it every single time regardless of rear gear ratio.
It's definitely not a never, but not right now. Out of curiosity, what auto would you use if doing it? 500, 518, or other? I know a lot of guys seem to like the 200r4 as it appears they fit with less structural surgery.