Yes yxmj, the standard 4.2 4-weight is used in their crate engines unless you specify differently. After installing my Hesco crate engine (not their kit) I had it dynoed to establish baseline HP/Torque specs so I could see what improvements (or non-improvements) my later bolt-ons would do. I noticed right off on the first run that I had a drivetrain loss of ~30% between the test stand engine HP/Torque specs and the actual at the rear wheels, which is pretty normal with the AW4. My original goal was to eliminate this 30% drivetrain loss with bolt-on upgrades. These included the 01 intake, bored throttle body, a Mike Leach long header, 2.5" dual exhaust system, Unichip, and some ignition and A/F stuff. Since Hesco is right down the road from where I live, I brought it down once a year or so to check the results. On the last run a few years ago I was up a 40% improvement over original, so I eliminated the drivetrain loss and then some. I was happy with that and haven't done much since except little stuff. The 01 intake was actually a 12 HP gain (at 3500RPM) which debunked the BS that the "horse shoe" intake did nothing and could actually degrade performance. All this is documented on the stroker forum.
Unless you see the actual dyno results for what you're doing before and after, claimed improvements are nothing but BS. The butt dyno is highly over-rated.