Sounds like an original manifold. Now whether it belongs on the car....all I've heard over the years is that there were no aluminum intakes in the '70 production run. But this is admittedly tribal knowledge that may be BS. I am a bit impressed with what the original owner did with the rear plug. The photos I've seen of the stock plug installation are nowhere near that nice.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
