It's definitely NOT 70's style. By the 70s multiple carbs were way out of favor with everybody and big single Holleys with velocity stacks were in (along with side pipes or purple hornies and foot long shackles).
It wasn't until the mid to late 70's that you started seeing blowers on the street and they were 71 series style. The little blowers didn't even exist then. Of you saw an adaptor on an intake it was a JC Whitney unit allowing a 4 BBL carb to be put on 2 BBL intake, (those guys usually got laughed at).
In case you're wondering I was street racing a 62 Chevy II back in the early 70s with a single 4 BBL 327 and glide we transplanted into it.