Do we have to start a wanted thread to look for recommendations on where to buy a part?
The question was, "Where is the best place to buy an A Body under hood harness?"
That wording implies they are looking for new.
Year One sells M&H harnesses, that is what I have in my 67 Barracuda, look and fit is exactly like factory.
I have had Evans do an engine harness, again perfect, it wasn't a typical harness so they needed a sample.
Alan