Three Jack Stands or Four?

Getting ready to remove differential on my '65 Formula S (has a 489 case 8 3/4). The car is stripped except for K-Member, spindles, torsion bars, steering column, differential, and leaf springs (no glass, no interior, no motor, no transmission, no driveline, etc).

I placed the jack under the carrier of the 8 3/4 and placed two jack stands on the frame right in front of the front leaf spring bolt/pivots.

I placed the jack under the center of the K-Member and placed jack stands under both control arm/A-arms close to the front stabilizer bracket. When I released the jack, the vehicle was only resting on the drivers side control arm while there was about a 1/4" space between the jack stand and the passenger side control arm. Had to put a slice of thin plywood under the passenger side jack stand so the vehicle would sit on all four stands-not just three. I expected to find more flex in a 50 year-old vehicle than that.

i suppose these cars must really be light after having taken off so much drivetrain. The floor of the body shop must not be level or my vehicle is tweaked somewhere a little bit?

This is all in prep of fabricating the wood lattice to turn the vehicle 90 degrees on its side to paint the bottom structure.