Stop in for a cup of coffee

4 speed with 2 overdrive gears? Why do you want a double overdrive tranny? What gear ratios does it have 1-4?

You know that tranny also requires speed sensor input for the speed actuated reverse selection lock-out too, right?
Yes

Cause I want to be able to drive this big block. Plus the .50:1 OD allows me to run say 4.10s but get the mileage of 2.76s.

2.97, 2.10, 1:46, 1:1, .74, .50

And yes, but that can be bypassed according
to several hotrod forums