Its not to much weight on that rear header stud?
its a 5/16 stud at least grade 5------good in shear for well over 3000 lbs-------two of them should be good for 6000 lbs--------don't tighten the nut on the chain more than finger tight and you should be good to go-------just dont forget to remove the engine mount bolts or you will pick up the entire car!!!!!............RC