Help convince me to go BB in my Duster?

So, I have a '74 Duster, who through a friend of a friend, can get a pretty solid 318, which would get built to 300-350, which would of been fine, but now I think it wouldn't be as enjoyable, or I'd always want faster?

I was looking into a 440 swap but everyone I know is telling me that it won't work, too much fabrication, front end will sag. Also is this too adventurous for a first-time motor swap? (i'd probably try to find one one CL that comes with trans, motor, msd, etc etc)

What all do I need for going BB?

I know through just common sense, I would need at least an 8 1/4 rear end, and from watching that one episode of Roadkill, I know I'll have some problems with the headers.

Is there a lot of fabrication into bracing the front end? Or would it just be heavy duty torsion bars? Do I need to mess with the trans tunnel?

My checklist so far (regardless of BB or SB):
- Schumacher Motor Mounts
- Heavy Duty Torsion Bars
- 8 1/4 rear end
- Some fabrication for the Headers
- MSD or some other ecu?
- disc brake conversion


Thanks for the help guys!