Short Answer: Personally given what you have I would say 7DII and 150-600, and I would also want to have the 1Dx with the 70-200 on it during the show. I would always suggest trying to find a good vantage point that is close to crowd center.
Since there is no map on the website it's hard to say where the spectators will be. Looking in Google maps it looks like there is a lot of open space on the airfield to the southeast of the runway. If that is where they put the crowd then it will be good, as the lighting will be perfect. If you are NW of the runway then the light will not be so good, but at least it is better than the usual east west runways we usually see in the UK. I'm a believer in the saying you cannot have too much focal length, hence 7DII with the 150-600 as the main camera. I hadn't been to a show in a couple of years, this last duxford show I was at, the Sigma 150-600 C seemed to be even more popular than the 100-400L of either version. Loads of Canon shooters now with big black lenses. The thing is that you will want a wider than 150mm on any of your bodies for shots of big formations. I only have APSC bodies, but I shot at FLs from 28mm all the way to 600mm, and you don't have time to swap lenses. A second body with something wider, say 70-200 on a 35mm sensor is also great if you can be right on the crowd line, and they have the aircraft taxying past you.
For a show like this I would be carrying the 1Dx with the 24-105 and the 7DII with the 10-22 during the morning for the statics. Then swap to the 150-600 on the 7DII with the 70-200 on the 1Dx for the flying. If the aircraft are really close though, you might get away with the 150-600 on the 1Dx and the 24-105 on the 7DII. I would have to be very close to the flight line to do that though. For single seat warbirds I still find that I often need to crop by 1.5× from my 50D, even shooting at 600mm. That would be the same FoV as an uncropped 1440mm lens on a 35mm sensor! It's all very well being able to fill the frame with the aircraft at the closest point of approach to you, but 90 degree side on shots can be pretty boring. Getting shots from the quarters means having to shoot them when they are a lot further away. It can also be quite tempting to pull back on the zoom bit, so that you can hold the aircraft in the frame better. I guess though if you shoot BiF you should be able to manage that.
I will re-emphasize the shutter speed limitations, with a prop I would always shoot at under 1/200, and if the number of display runs allows I would try some at 1/100 or even 1/60. For helicopters you really need to get down around 1/100 for good rotor blur. At least digital allows you to shoot lots of frames. I try to shoot three shot bursts, hoping that I get the middle shot OK, and losing the first and last to induced vertical camera movements, pressing and releasing the button. I mostly shoot at 1/160s as it usually gives acceptable prop blur even on a landing run at minimum revs.
My show gear for the flying is my 50D with my 150-600 and my 20D with my old Sigma 28-300 for the wide stuff. For the ground displays it's the 50D with my Sigma 20-40 f/2.8, and at times the 28-300, sometimes the static displays can be quite far away, even on things like a flightline walk. It's really only at a museum, or other indoor display that an ultra wide angle lens will be necessary. I don't have one, but do find that I could really use one at times in the museum halls at places like Duxford.
You can of course get good shots with just one camera and lens, but for propper coverage you really need two bodies for an airshow.