If you're looking to buy a 426 Hemi, a 572 isn't that much more considering the added power you get from the bigger displacement.
Mopar Pro Shop - Mopar Performance Parts (MoPowered) - BIG BLOCK HEMI CRATE ENGINES
572 Street Hemi Package | For Hemis Only
Lots of options in between as well.
There's a guy in Osgoode Ontario (
Welcome to ASE Motorsports | Classic Car Restoration) who was fabricating new metal Daytona nose cones after he had to make one for his own car. Not sure if Al's still making them but he's a great source of info for the wing cars.