I read it as being
3400# base weight for a 477cid supercharged big block. B1's are your best bet for a head.
-50# for being pre 1974
-75# for Mopar
-50# for stock suspension

Puts you at 3225# Unless i am reading something wrong.

-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA