Yeah, you can get 15 out of that, but it's going to take time, patience, and re-learning how to drive, if you plan to keep doing it w/ that automatic.
If you're got a u-pullit yard near you, you can probably get a 5 speed OD swap for less than $200, buy a new clutch for $100 or so, and you're good to go. It'd probably be the first thing I'd do. Beyond that, see if you can find yourself a 6.9 or a 7.3, preferably Turbo. They can both be installed as standalone engines, with no real work necessary to the truck, other than installing and changing fuel systems.
I usually see these engines on craigslist for ~$500 or less, often in good running condition, and parts for them are cheap.
Another great option would be a 6BT Cummins. You can see where this is going.
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