Steering Box - What model is this? Should I upgrade to power?

Power is neither an upgrade nor a downgrade, it's just a change. The only wat to tell, as far as I know, whether that is a 16:1 box or the standard 24:1 is to count the turns lock-to-lock. Around 3.5 for the 16:1 and 5.5 for the 24:1. Power requires a shorter steering shaft and a different coupler.