Gordini gearbox
The blue car looks better than fantastic.
However when I ran around in a Gordini engined 4 gtl, 15 years ago, I found the original 4 speed box lasted fine for ages and the ratios were good for acceleration and cruising.
I can remember comparing clutch, radiator and brakes from the donor 5 Gordini to the 4 GTL and it was all the same. The 4 had the advantage of less weight if I recall.
The only performance mod apart from the engine was the addition of van anti-roll bars front and rear (the mounting points in the rear axle were pre drilled and just needed tapping). The 135 remoulds were well up to the job.
It was the best weekends tinkering I have ever done.
I remember beating an RS2000 at the lights. he was very surprised to see me beat him with my three passengers. He was even more surprised when the boat I was pulling at the time, also went past him (it was only a small one).
Wish I had kept it, it was a perfect car.