Sounds like a blast
The only issue I see you having as said is heat. If I remember right you have a 1 mile area you must maintain your speed over, not to mention getting up to that speed.
Our cars are built to get up to a speed in a hurry but aren't very well designed to maintain those high speeds. Modified series 2'* have driven the autobahn and maintained 140mph speeds ... so a series 1 can do it...
However, the M62 is basically at it'* max output from the factory.. smaller pulleys on that blower start to generate more heat than is helpful in getting max performance.
The heat from that blower holding 130+ at 5,000+ RPM for a mile is going to be big. I suggest *which you may already have in mind* running a 104 octane fuel to help curb the heat effects and prevent predet.
A cutout might be a good idea too... it will be loud as heck but will help scavange those exhaust gases out a lot faster at those RPM'*, hopefully saving you some underhood heat from the mani'* turning red. I would run a slightly richer fuel mixture as well if possible, again in helping with heat.
You don't really have to pay much attention to it if you were only going to do it once, but multiple passes in heat like that at those speeds, that blower is going to turn into a gigantic hair dryer LOL
OH, and don't let it shift into OD at those speeds.. the 4th clutch has MUCH less area than 3rd and might not be happy.