You read that wrong, you CAN use an Alpha lower on a pre-Alpha upper. Look right under the picture for pre-Alpha Upper Housing.
Ah, I see it now!
And, you say that lower units are all geared the same, so I could buy any Alpha outdrive or any pre-Alpha outdrive, and as long as I only use the lower unit from it, I'm ok.
So, I could buy the outdrive for the 305 V8 and as long as I only use the lower unit from it, right?