Safe 8 3/4 axle lift

I will ad my 2 cents I've had 8.75 rears in 9000lb imperial built derby cars and still lift with center of diff and that's welded in solid with zero give. mention the violent side impacts against concrete barriers from other well built cars and I've only ever bent one rear end and that was a 10bolt chevy rear. Aint no way you will ever even flex one in an A body. Just to give you piece of mind.