It doesn’t matter which way you install the plate as the ignition timing is controlled by the control lever on the front of it. The further you push it to the port side, the more you are advancing the timing and the faster it will go. Going the other way to starboard retards the timing and if the lever is pushed all the way, it will shut the motor down.

Here’s some NOS Zephyr points showing the short push rod with one end rounded. The rounded end goes towards the points. Since your points arte 70+ years old, they are probably due for some maintenance. Carefully disassembling them one at a time for cleaning and polishing of all the pieces will ensure you always have a complete set for reference when reassembling them.