[Hammer]

Actually, some upper and lower LCAs, maybe some 9 inch wheels with some drag radials (Do Bullits come with 9 inch wheels?).

They will go a long way in lowering that ET....
Think traction... think 60 foot.... a HUGE factor in a 1/4 mile run.

As far as the items you listed above.... It's purely a guess, but I would say to expect around a 30 rwhp improvement.

The easiest way to find out your times are, surprise, take it to the track and get some baseline runs.

Then start using the Mustang Analyzer on the site... its pretty darn accurate once you have some baseline numbers in your hand.

As far as 12s... with the above, I think it would be possible, just be sure to get a good launch and traction between shifts...