the manifolds are 3873432RH and 3989043LH they came off my 69 camaro 350 ss but not sure what they are original for. i also have an original set of pulleys 3 groove crank# is 14023148BD and the 2 groove water pump is 14023155CF they also came off this care and not sure what they originally came on.. i am tryin to sell these things but i would like to know they originality to help me sell them. thanks

I can't help with the pulleys but here are what the exhaust manifolds came from.
3973432 (did not find 3873432) - 1971-72 307,350
3989043 - 1970-73 307,350

Both were fro A, B, F and X bodies.

thanks