This is the highest HP car I know of in the US.
2.6L, Apex TCW-76's, Apex Rods,Crank, and Pistons, Apex Power FC, Apex cams, Apex fuel pumps, XS boost pack, Custom injectors, and XS Rebuilt trans.
Dunno if you have to register for the site to see the post, but this is where I got the info...