You've have two choices, correct Try them or replace them
I would try them, do a pretty long burn out to get to better rubber and be careful on that first run
My S/P car had sat for over 6 yrs before I bought it and started racing it, it had a set of older Goodyear 16x33x15 tubeless on it that had one set of the cords on outside of the tires, both sides on both tires, broken at the wide part of the sidewalls
It hooked and ran good, 9.23 at 143.MPH on the throttle stop for 1.7 seconds weighing right at 2750 Lbs. with me in it, for the rest of that year on those tires
If there is any doubts in your mind about them being safe please replace them