I think we better slip the Dana / slicks n' tricks in for a final test / look see and make sure all is happy....and we can get a driveshaft measurement.
I put one of those scoops on my hemi car back in the day, it was a ***** on the 66-67 belevedere hood to get leveled, I didn`t and it bugged the hell out of me for yrs. How wide of rims are you going to run on the rear ?