You only need to know three things:
1). Bell housing style. 157 tooth is physically smaller than the 164, that is good. It also has the case fill box, which is also good, as the pan fill tube sticks out a lot further.
2). You need the torque converter to fit the matching flex plate, which I believe you already have, and this is confirmed by the stud spacing (PCD) of the 157T flex plate.
3). Drive shaft yoke. You will need this to adapt to your original drive shaft.
It is not difficult, you don't need to over think everything. Make sure you fit all the components to each other. Fit the torque converter to the gearbox. That should fit because it came with the box, correct?
Fit the flex plate to the torque converter, the studs should go all the way through.
You need the correct metal plate. speedway's will fit either bell housing as it has two sets of holes for the starter. You use the later starter (small block Ford).
Make sure the starter has clearance to the block. I think you need to grind a little off the block or starter. I used the V8 starter with the solenoid on the side and found the solenoid interfered with something (exhaust or chassis) I got a starter from a 6 cylinder and it has the solenoid at a different angle.
ps. Your adapter is just a flat crescent shaped 3/8" plate that has both the 8BA and SBF bolt pattern. It does not look anything like the adapter in post #22.