That's called driving the car..... It's how you consistently, everytime, cut 1.8's with an open 2.94 rear, stock converter, and stock 360. It's called Tuned & Driving. Now go get 'er done !!!!!! 11.9's in street form with no more bolt-ons!
I would have a hard time understanding how you couldn't get 1.8's with that combination.
again I'm interested in your break down from a 13-3 and what a cam is going to do to that and what the heads are going to do to that and the converter and the gears...