[American Constitutionalist]

The car has a 7 speed manual transmission.
I don't know why he didn't punch it into 6th gear to reach 200 or perhaps he knew what the car was capable of and didn't want to take it to 210 220.
There was still a lot of speed left in that car to be able to take it to 200 MPH in 5th gear ? impressive.

[nascarnation]

6th (.57:1) and 7th (.48:1) are deep overdrives for cruising.
Even at 200mph the rpm would likely be too far off the power peak.