Quick SBC cylinder head question

[nuch_ss396]

I've got a fast question for you knowledgeable small block
Chevy guys here.

Back in the mid-1970's I was helping an acquaintance pick
up a Hi-perf small block from a wreck yard. It was reported
to be an LT-1. The odd thing was that it had angle spark
plugs and I believe the heads were actually aluminum. I'm
not sure about that as I may have gotten this situation
confused with other engines purchased back then.

Simple question is: Did GM make an over the counter angle
plug head back in the early to mid-1970's? Were they available in aluminum?

I don't know why this popped into my head but it's bugging
the crap out of me. Can anyone verify the existence of such
a SBC cylinder head back then?

Nuch