Don't feel like crap, it's an easy mistake to make. As far as times, they have some formulas on their website but I don't agree with them. It says your truck would go 10.08 @ 78 which isn't even close to correct. I logged mine (got to love stealing electronics off the race car) when I went to the track. At 500 feet it was 8.09 @ 68, at the 1/8 it was 9.61 @ 75, at the 1/4 it was 14.88 @ 94. The 1/8 and 1/4 times matched my time slip pretty close so I have confidence in them.
Your et is very close to mine but higher mph so I can't make a guess with complete confidence but maybe 9.5 @ 78?
Sure would like to make it out to Two-Lane Blacktop someday with my Jeep, love those hole-in-the-wall tracks. We had one up here for a couple years but it sits in limbo with the lawyers now.