The car probably isn't as heavy as you think - shipping weight on a four door Star Chief was 3,920 pounds.
I agree with Scarebird, installing a BBC is mainly going to be a matter of coming up with new motor mounts. Assuming you're planning on a TH400 automatic transmission, you may as well just find a Chevy version; the existing transmission would need to be rebuilt anyway to handle the additional horsepower.
What kind of rear end differential ratio are you planning on? The existing one is most likely something in the 2.XX:1 range, and steeper gears may be difficult to find. Since the rear axle housing is probably going to need to be narrowed anyway to work with your wheel/tire combo, you may end up having to go with something like a Ford 9 inch setup.
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