See if the ignition for the BME or the Quadra 75 has SS engraved on the back of the case, then the SS is built in the ignition. If you have just external SS units then the Q75 and the BME 44 need one.
I have never used the compression release, just flip the prop like you mean it. In theory you push the compression release down and when the engine starts it automatically pops it up.
P.S. you scored about $2000.00 worth of engines.