My first question would be what cam?
Cuz with 2.76s , and a 2.66 First gear, that car will easily hit 60/65 in first gear........................ even with the stock cam.
If the long-block is still at 8/1 compression, and your Intake closing angle is significantly later than stock, at 3600 pounds, the bottom of first gear is gonna be really lazy.
If it's gonna be a true DD, I highly recommend to get this sorted out now, before any assembly takes place.
The factory 360 2bbl cam is actually pretty good for an 8/1 DD