1970 Duster, Trans-Am-inspired "Pro Touring" build

Also this past month I was loaned a 489 center section by fellow FABO'er "nothingbutdarts" with Sure-Grip and 4.10 gears which I recently swapped in to feel the difference compared to the 2.94 gears my 8 3/4 came with. It is like night-and-day, takes off like being shot out of a cannon but screams on the highway like it lost top gear lol. I'm hoping to take it to a Test & Tune at my local drag strip (Bandimere) this Wednesday and see what kind of times I can pull; I'm thinking low 14's (remember I'm at ~6000 ft. above sea level)