It is very good to learn that you are not only a grease-under-the finger-nails builder/fabricator but also a racer with a growing eco-heart. Your SCCA, Solo Series & MG club racing experience is also a great insight to your true car passion. Your thread general discussion may need to extend onto a larger scope for not only for an aero/ FE engine package but also one with great handling & performance dynamics. I suggest adding to your research.
TTW - Motorized
I've have been studying TTW for some time because of it's hybrid driving dynamics & important smaller aero front profile. A racer enthusiast's joy of great driving experience with a great FE capabilities can use this as a great inspiration for the build.
Crash tested too.