Help me with this argument!

So a good friend of mine and I, got into a friendly discussion about what one is lighter. Here's the setup.

Mild 273 4 bbl cast intake, stock cast heads and exhaust manifolds, push button 904.

VS

408 360 LA based aluminum eddy heads, performer rpm air gap, dougs d-450's and Tko 600 5 speed tranny.

What do you guys say which one weighs less?