A B2 bomber and a completely unclassified car engine is a slightly different order of magnitude in terms of complexity.

If you want to run a current F1 car in 40 years time then you will need to RE it however because the Powertrain is complicated and totally custom

> If you want to run a current F1 car in 40 years

Never mind 40 years, F1 cars of even a couple years ago become impossible to run because just getting the engine started requires custom equipment and knowledge that often doesn't seem to be preserved year to year.