and
those are all power steering brackets
are you running power steering ....

manual steering only had the single front bracket
a large C shaped ...

looks like a 68 timing cover 1 year only
68-70's balancer
non ac water pump and 68 n newer crank pulley

4" water pump

power steering rear bracket 65 66 ? the bottom half doesnt look 67 n newer ...and 67 68 ? upper adjustment brackets

Scott

oh

and possibly when using the front thermo stud it throws off the adjustment slot at the alternator
I would lean towards the wrong altternator mounting bottom bracket

it all comes back to are you running power steering or not and the alternator mounting bracket thats correct for your needs

to me it looks like your mixing years of parts and manual and power ateering