I have a pair of small block exhaust manifolds with the alternator bracket on the left side.I think they are for 67 and earlier.Can anyone tell me if they are worth anything?
Casting # GM 3892583 LH and GM 3572730 RH

They are 67-68. I paid $40.00 for my last pair. I have seen them sell for around $200.00 at times though.