You dyno and horsepower guys kill me. Lol. Get the damn thing to the race track and put in some work. My little 422 with a solid lifter cam has gone a best of 5.98 and a boat-load of low 6.00’s. Not at some coastal super track either. Off the shelf pistons, no vacuum pump, no special ring packs, and a bracket sized tire 4 inches bigger than needed. Sure it’s 2880 pounds but yours could be too.
it has gone 10.3@130 with a 727 with a street converter in a 3800lbs RR in full street trim on a 10x29" Hoosier tyre on a no wind day at Santa Pod. if that was aimed at me?......I don't hold much on dyno's either but this time this one was on the money EDA is the company.