If you're interested in building one, here's a Hot Rod magazine article.
How to Add 129hp to a 5.9l Mopar Magnum - Engine Buldup - Hot Rod Network
I just picked up a low mileage 5.9 and am getting ready to build it. For now just intake, carb, headers, torque converter and timing set. Should get it to around 320 hp. Headers are the biggest expense since it's going into a 66 Barracuda. Hopefully I'll do it for around $2k.
