Center of gravity

Hillbilly method: put a 2x4 under the car from side to side. Put a floor jack under each side under the 2x4 where the 2x4 contacts the jack point on the car you want to use. You may need to use some other lumber to distribute the load on the car so as not to damage anything. Jack it up on both sides even. You can use a tape measure for height and position to get it level and even. Repeat the process till the car balances.

That gets you front to back, I would assume side to side is in the center.