Higher engine moves center of gravity of the mass up which will give additional weight transfer to the rear when accellerating forward.
Moving engine and center of mass up will also raise center of gravity which can possibly negatively affect high speed handling if taken to the extremes, which is why now the NHRA rule book has placed a maximum limit of how high the crank can be from the ground. Pro Stock engines are very low to the ground.
When you move the weight mass upwards it has effect on the suspension settings as well, which can decrease the initial force of suspension reaction to the rear tires or decrease tire hit. So it is a trade off.
If you keep all bars the same and move weight up the bars will hit the tires less but the weight transfer will be greater once the car has begun accellerating and as the front comes up even more weight is transfered to the rear tires.
At times you see this happening in cars but not everyone is aware of why the front wheels keep climbing as the car is going further down track with the cars with high horsepower. It is the weight transfer keeps increasing to the rear the further up the weight mass goes and the quicker the car accellerates the high weight mass will tranfer to the rear even more which keeps the front up. lol.
I think I will come back and copy this and add it to my Chassis Article. Maybe someone would be hleped some by understanding why this happens. Man I wish I could think of and remember everything when I am trying to write articles.
Ed