I would say from my experience that you should be ok, I had the Moser 30 splin axles, Detroit Locker and new 3.90 gears in my 8.5 and it ran good when I was running in the 10.74 range with a 3700# car with 1.46 60'on the foot brake.
I do know some people who have gotten into
the low 10's with them but there 60' and weight of the car was lighter (3500# range).
I had no problem with the 8.5 until it meet
my new stage motor and the T400 with a brake.
This changed my 60' to 1.33 and it only lasted 3 passes when the pinion gear took out
all the teeth of the ring gear, nothing else was hurt so my car now has a 9"
Take Care
Neal