$12 k hun! Man $12k would get me a low mileage 5.9 Cummings and drive train. Emissions would be easier to pass than the 351w with all the additions! More TORQUE because Horsepower is not as needed as torque is to move weight! IMOP! You'll wear out the 351w before the 5.9 hits midlife!
Reviving this old thread. What did you end up doing? I have a 94 with a 5.8 that just hit 200k and I am looking for options. I think a top-end kit with 400 hp and 400+ torque would be a good addition to the van.