Jegs right now is $1460 free shipping for that engine:
http://www.jegs.com/i/Chevrolet-Performance/809/10067353/10001/-1With a nice dual-plane manifold (Edelbrock 2101 or 2701 depending on carb) and some Hooker headers (2452 or 2453 depending on 2WD or 4WD), you get 260 hp and nice torque.
The 290 hp Goodwrench engine 12499529 has a misfit cam out of a 1960s engine with high-compression heads; with low-compression heads it can't get out of its own way at low rpm. It's a wind-up toy, and no good for a truck. You would need a high-rpm stall converter if you don't want to help push it started off the line. BTDT.
If you want something more than the 350/260, there are modern cam options that can increase torque, or horsepower, or both, but they will void the warranty. BTDT, too.