4 speed od or 5 speed

Thanks. I am looking at going AX-15 for my 70 Dart, which I might just use a .060" over 318 with custom forged Ross flattops, (light) for 327 or 328 CID, I have a fresh 2.93 sure grip.
I know the 1st gear is a bit steep, but I am not using a super low duration cam, I am thinking a mechanical 240 duration (about like a 234 duration hydraulic) .540 lift. 112 lobe seperation. That should have a broad powerband, about 2800-6800, maybe 7200 if needed.

Between that, the intake I am thinking, Offenhauser Port-O-Sonic single plain, and my aluminum flywheel, should kill a bit of low low end, to where dropping the clutch doesn't just result in massive wheelspin.

After reading this, I don't know what I will do about the bigger ring gear needed for the flywheel, but I'll figure something out.

I do not know how I will get the shifter to come over to the left and fit through the tunnel, as well as what modifications are needed to the cross member?

I'm thinking I could make the shifter go welded on to something that goes 90 degrees and over to the left for about 4 inches then back to 90 degrees straight up, so the shifter sits in its original position?

Shifter is a medium length B-body pistol grip, that was found in a Jeep. Went to get a wheel or something from a salvage yard, and the salvage yard worker was driving a truck through the yard. As he was turning, the pistol grip caught my attention. Somebody had welded it onto the Jeep shifter.

This car will be built for street, autocross, and an occasional 1/4 mile.