i pulled out the /6, and installed the 440...it did hold the 440 up, not to where i liked it but driveable i never driven the car, it has never left the garage, i decided to rebuild the suspension which i did, and here we are,,,lol
So I'm wondering if you dropped the motor in from above, the tires held some of the weight by not moving laterally. Now then they have unweighted and set down again, you're getting a "real" sense of how weak they are compared to "correct" ones. Just thinking out loud....
