I dunno about F body brackets at all, but on my '88+ vette serp drive on my '72, what with having earlier iron heads on it at one point, the brackets have broken on both sides....on the a/c side I got lazy and left a bolt out since no boss on the head, near the intake mani.....it was fine, but then I got disgusted some time later and left off the brace to the exhaust stud from the a/c comp....that did it.....:surrender:
on alt bracket, I never did figger why it broke.....
my welder buddy fixes them no sweat....so no loss...
neither side has any brackets to the exhaust manifolds at this time....so far so good,....but all bolts are used as L98 heads are on there now....