6.9 is a decent engine, not going to win a drag race but it'll get you there. A family friend has a 84ish standard cab dually that only hauls a 17k 5th wheel. We put a T18 in it and a gear vendors OD. It already had a ATS turbo kit when he got it but the auto SUCKED the power out of it so we put in the stick. That truck hauls some serious butt for what it is that's for sure.
I'm picking up a 90ish F350 standard cab with a 7.3 IDI and a 5 speed, we'll have to compare notes if you get that one.
