Gearing ?

Well, maybe I can offer a little something of a measuring stick. One of my Dusters is in the "boat" with your idea. I know you checked in a few times on my "low dollar 318 build", and I have 2.76 gears/904.
My shift point is about 5200 rpm's right now. I shift to 3rd gear about 100 ft before the finish line. IF I hold 2nd gear across the line, I'm at about 5400 rpm's at about 94 mph. So a quick guess, maybe 6200 rpm's would be about 105 mph??
I have stock converter, and about 26" tall tire.