Measuring front ride height- 90 - how to?

[Corvette95]

I want to measure the ride height on the front (rear too while I am it) to make sure it is stock ride height. It looks lower to me, leaf springs are good and ride is fine, I do not see any lowering hardware . Where would I measure from point A to Ground to verify front and rear ride height and what would I look for (from a hardware perspective) to see if it has been lowered. Thanks!