66 Formula S engine color

It should be red.

But here is the problem.......

If you took every 66 engine that was panted red and lined them up they wouldn't all be the same red.
The paint was mixed in bulk batches, each batch could and would be slightly different.

I good example of how this works today is a Toyota. The gold used on something like a Camry has one paint code but PPG has 14 different mixing formulas.