I'll give you my thought process behind it. I know your 3200 lb duster when low 13s with a low compression 360 and a open 245 gear (somewhere around there) the van if memory recalls has a sure grip with lower gears. And I know that 5.9 is probably hotter or just as hot as the low compression 360 in the duster. The van is not as heavy as you might think. Im guessing 4200lb. So 1 tenth per 100 pounds that's 1 sec. Take a few tens for the lower gears and possibly stouter magnum I end up at around 14.5 but you driving is worth 2 tenths so I ended up at 14.3 lol good luck I hope im right
