the FE is 95 lbs light than the 460 in stock form.
FE can be expensive to build if you have to have that 482 cube all aluminum.
But you'll never need that much in a 2400 car. A well build 390, edeblock heads, aluminum intake, water pump like said above will still make plenty of power & torque and you'll have a great drivable, reliable engine that looks at home in the Cobra.
Here's a turn key from Keith. A little over $10k, but look what your getting.
http://www.keithcraft.com/engines/39...te_Engine.html
Some other options-
http://www.southernautomotiveengines.com/406engine.html
Add aluminum heads and $7900 aint a bad price.