Pulling stuff off the RB 440 engine and getting ready to throw a few things on, I work in a pretty "calibrated" industry so I thought I'd get some weights from our certified scales that go to the .05 lbs, you know, for science:

Assembled Heads:
Stock 906/ea - 50.20
440 Source Stealths/ea - 29.0

Intake Manifold:
Factory Iron 4bbl - 42.85
Eddy Air Gap 4bbl -16.5

Rockers:(each rail/complete w/bolts)
Factory Stamped - 4.75
Comp Magnum - 6.35

Power Steering Gearbox
Factory 16:1 - 35.9
Borgeson 14:1 - 23.8

Total loss on the chassis (on/over the nose) 77.65 LBS!