I like the look of this old school scoop. It would look nice on my street rod engine. I've read reports on having too small air filter on engines. Thoughts on how this would run with 401 Nailhead.
I think an adapter has to be made to fit the filter into and bolt to carb. Filter would go on top of adapter that bolts to carb , then scoop goes over the top and bolts up from underneath --- somehow. Similar to a Hillborn style repro on the market. I have one of those not fitted , but like the look of this one better.
Here's a picture of the Hillborn style scoop I was going to use. The adapter has a 6" X 2.5" filter I would say the old one would be similar. Could possibly go a higher filter with the older style ??
If that can only take a foam filter then you might as well pull all of your spark plugs out now, dump some fine sand in each cylinder, then run the motor a while and get right to rebuilding it because that's what's going to happen to a motor that's run with any foam type filter in most environments within 8000 miles ( or far less on a race motor due to higher average cylinder pressure) when the rings and cylinder walls get chewed up! Your concern about airflow levels into the Carb are secondary!
Even with a round paper air filter I would have say that the motor would run better without the scoop unless you get it up above the top of the radiator, other wise it's just going to be ramming in hot air in from the radiator, in which case a regular big round air cleaner would work better.
