340 2 barrel manifold

I was asking because I found a small block with factory orange paint and valve covers,its never been apart or messed with,it was removed from a brand new car back in the day,but it's only got a 2 barrel manifold,could it have been a special order?
1968-69 318s 2bbl were painted red that after age, grease, dirt & what not, can take on an orange'sh apperance...could this be what you saw?
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there would certainly be other indicators even from a distance without reading block #s. ex manifolds, fan, that sorta thing.