383ci Exhaust Manifolds and Alternator

The alternator is a 20$ unit if that,might be more if it,s a correct date code for some one???
1) 2899879 is a 72 B&C body 400/440 manifold,maybe a 50$ part
2) 2951861 is a 70-73 C body 383/440 manifold maybe a 50$+ part
nothing of real value,mrmopartech