Reviving this thread because a body is in the works that WILL comfortably fit the maximum sized V8 engine in the game. This merges the previously distinct considerations of what a max power engine was, and what the highest power an engine that actually fit in a vehicle were.
So out of curiosity, is this as far as we can go now? I’m not usually given to exploring this particular question, so if you found anything more out of the setup, please do post!