Personally, for non-centrifugal superchargers, I like the Kenne Bell twin screw. It does require you to convert to an EFI but if you haven't done it yet, you can absorb some of the cost of the conversion since the KB kit includes many of the parts you would need anyway. The KB supercharger is not a wipple type supercharger (such as the Eaton and Holley). There is a good explination on the differences between the two on the Kenne Bell website. Here is the article. Additional details can be found here.
If you stay carburated, you can go for the Holley, but I doubt you can fit it under a stock hood.
If you want to keep it under the hood, your other choice is Paxton or Vortec which are both centrifugal superchargers. Each have special casings that pressurize the entire carburator. Vortec has carb versions for Chevy but I have not seen a kit yet for Fords. I'd give them a call to see where they are in development if you are interested.
Vortec
Paxton
If you stay carburated, you can go for the Holley, but I doubt you can fit it under a stock hood.
If you want to keep it under the hood, your other choice is Paxton or Vortec which are both centrifugal superchargers. Each have special casings that pressurize the entire carburator. Vortec has carb versions for Chevy but I have not seen a kit yet for Fords. I'd give them a call to see where they are in development if you are interested.
Vortec
Paxton