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I don't believe the 5.4 GT engine will fit the car. I have a blown 4.6 and it is an extremely tight fit. The 5.4 is not only a one inch taller deck, the supercharge package is also taller. On a 4.6 the blower and its top pulley nearly touch the hood.
By the way the the engine is very light. When I started I saw all the same 650# stuff. The real world is different. Aluminum Block 105#, heads complete 65# each, Crank 55# rods & pistons 15#, Dry sump hoses and pan 17#, Whipple blower and manifold 70 or 75# (I forgot). Supercharge it! The blown version of the engine has a torque curve that is flat as a pancake from ~2000 to 6000+, you won't believe its responsiveness. This is one potent engine package.
600 HP in a blown 4.6 is easy. The car's fear factor is staggering! Don't forget to get some driving instruction if you've never handled this power level in a light car. It will bite you in a blink of an eye if you aren't paying attention.
Ed
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