The 3.3 is a direct injected version of the cyclone and duratec engines (3.7 and 3.5 respectively) There has been some other revisions. I don't know exactly what all has changed as Ford is busy trumpeting the next crazy level of power the EcoBoost engines are making. Should be pretty reliable.
In that post, we gave the 3.5L engine high praises for its performance, efficiency, and reliability. Thus far, the 2.3 EB engine is also showing many of the same traits. Albeit in a smaller package. 2.3 EcoBoost Common Problems. A few common problems on the Ford 2.3 EcoBoost include: Runs hot; Carbon build-up; Head gasket (early Focus RS models)

Production numbers of the 3.0L Duratec started out slowly in 1996 through 1999 but increased significantly once it became the Taurus/Sable base engine and then for the Escape and Tribute in 2001. One half a million of these engines have been produced per year, putting total production at about 3.5 million 3.0L Duratec engines manufactured.

The SHO engines share a common bell housing pattern with the following Ford engines: the 2.3/2.5 L FWD HSC I4, the 3.0 L FWD/RWD Vulcan V6, and the 3.8 L FWD Canadian Essex V6. In 1996, Ford discontinued the SHO V6 and began fitting the Taurus SHOs with the SHO 3.4 L V8 and the Ford AX4N automatic transmission .

Compared to the 2.7 EcoBoost, the 3.5 EcoBoost is capable of towing about 4,000 lbs and more. In fact, the 3.5L engine on the F-150 offers the best towing capacity. The same applies to payload capacity. Most F-150 owners, however, will probably be happy with their 2.7-L engine’s towing capacity.
This 5.4-liter supercharged engine produces 380 hp (283 kW) and 310 ft-lb (610 Nm) of torque. Ford F-150 Harley Davidson Edition. This 2002-2003 model was equipped with 5.4L supercharged and intercooled V8 engine. Power output: 340 hp (254 kW) at 4,500 rpm, 425 ft-lb (576 Nm) at 3,250 rpm. ← More Ford Engines. . 143 355 29 179 203 278 395 92 359

is the 3.5 duratec a good engine