With a BBC you are going to have GOBS of torque. I don't know how much exactly but running a 2500 stall with 3.73 gears you are going to get off the line in a HURRY!!!! I mean smoking!
What he means by fighting it at the light (as I figure) is that you'll be having to stomp on the brake to keep the car from going anywhere. It'll WANT to go forward.
For true street with a TH400, especially since this is going to be basically a daily driver...I'd personally go with a lower gear, say 3.32 or 3.42. You'll be much happier around town and It'll give you good highway with that 1:1 final gear. Not to mention with the torque you'll be shoving to the pavement with the 454 you won't burn all the rubber off your tires just easing it into first gear. With a 3.73 and up you won't be able to keep tires on the thing.