You'd never want to use 48 IDA Webers on an SOHC. They are way, way too small to make decent power. During my intake testing on standard FEs the 48 IDA Webers started giving up around 550 HP, and were way down on power compared to some of the Holley carb combinations at 650HP. Given that a stock 4V SOHC is 616 HP, the Webers would be a step down. And the 4V SOHCs were carb limited too, since just the change to a 2X4V setup netted an additional 40 HP.
The Hilborn manifold, on the other hand, seems to work great; mine is converted to EFI and is very street friendly, although touchy about the butterfly adjustments. I made 960 HP with that manifold on my big SOHC. If you are interested in an individual runner setup, the Hilborn is the way to go.