Hi Converse,
The steel deck on the Commando is a pretty tough base and replacement catchers are dead easy to get a hold of, compared to the thumb latch type on my Corvette, which suffer cracks too easily.
The half crank Powertorque has 7% more power in base form and even more on the higher output versions.
The full crank is supposed to last longer. For longevity, the 125cc is king. The last one of those was about 1977/78.
A twin overhead cam V8? That's Lexus territory. The Windsor in my 92 Fairlane is still pushrod!