an attempt of overtaking [AzyerGames vs EL 34]

[AA™| Vim Fuego]

If we go bumper to bumper (its front bumper is equal to my rear bumper) should I leave a place?

No, absolutely not. If there's no overlap at the point in the braking zone where you turn into the corner, you have the right of way all throughout that turn. You may take any line you wish at any speed you wish through the corner. They may not cause their car to touch your car at all. They will need to adjust their path and speed in line with yours and suck it up.

Talent permitting, or due to driver-error,  they may safely achieve overlap part-way through a corner or series of corners, at which point both drivers are required to leave fair space for the other.

Single-seaters only require the front and rear wheels to be aligned to achieve overlap, whereas saloon and sportscars usually require a greater degree - dependent on the class it can vary from hood/wheels/driver/door alignment to the same as single-seat rules - in historics for example.

LFS sits in a happy medium of "significant" overlap - I take that to mean front and rears aligned as the bare minimum in any case.