To stage your car at the perfect temp, depends on your combo, Greg has alum heads and I don't know if he runs water in his heads/block.
My JF engine must use iron heads & block, and we always run water because not only does it even out the temps around the two center cylinders but it does make more HP because water supports the clynders better and has better ring seal. also cuts down on the cyclinders from having harmonics [ like ringing a bell] , I've seen it on dyno pulls. OK enough on that subject.
We don't have a temp gauge on the car, I juse a infared temp gun to check the temps on the front of my heads just before it pulls into the lights, and I like 160-170° so it's up to 180-190° at the top bulb. alky fuel likes a hotter engine, it burns better. When I check the head temps after the run it can be 200-220°.
I had another engine in another teams JF car and they did not run water, so I kept the temps around 150°
I know of an ex NE-1 [ 7.60] team that fine tuned their car with engine temps , like if they ran a 7.55, they would run the engine cooler, like 10°, I think, to run 7.600.
You'll need to find the temps your engine likes, of course all that can change if you burn some nitro, I don't run any nitro, Heritage JF rule is pure alky only.
BTW when I have helped other JF teams staging and checking temps some take way too long to get any temp, because they did not lean the barrel valve enough, I set mine at 18% using a cylinder leak down gauge.
Jon