If a car has a 5 speed installed does that make it "not original"?

I do understand your point on the cutting the floor and trans/torsion bar mount cross member.

There has to be a point where an all original car is 100% original things like Detroit Air in the spare and so on.

My question should have probably been more specific like is it really necessary to have 6 speeds instead of 5 in a car that gets driven on the street to get to the track or high speed driving event .......not for a concourse show car.