How about a bolt-on supercharger or turbocharger kit?

Rotrex Centrifgual Supercharger:
http://www.rotrex.com/pdfs/Rotrex_Te...Range_V4.0.pdf
May fit on driver's side with air pump removed and power steering bracket mod.

Magna Charger Roots Supercharger:
http://www.magnusonproducts.com/mp122Carb5thgen.htm
This would require a custom cast or sheetmetal intake manifold.

STS Turbo:
http://www.ststurbo.com/universal_system