It was but the twin 4BBL was initially as good or better. By the 60's and the time of 327 it had more. I think these were the famous 375hp 327, L84. I don't think these went as hard as a 1970 LT1 (rated 370hp) but still were awesome. This is where the original "fuellie" heads originated. IIRC the injected 283 ran powerpack heads, like a 361 fuellie but smaller valves. I think I have one of those engines in my shed, but maybe only a single 4BBL Carter.
Good read at Wiki:
http://en.m.wikipedia.org/wiki/Chevr...l-block_engine
You can see our manual HT-HQ engine (L48) spelt out quite clearly.
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