Given that you don't know what it's really turning, I'd likely wait on that tach.
With a healthy 220 and that prop, it certainly should be able to run dry barring something out of the ordinary.
As was pointed out 2800 is the number to start with those blades.
As far as the jacks go, if it runs OK in the water, it's likely best to leave them be for the time being.
If your prop is not perpendicular to the stringers is should be real close (or crank parallel to the stringers, same difference), possibly just a hair higher at the prop end.
Those last two are hull fine tuning issues that really need dealt with AFTER you have the engine right and the prop pitched sufficiently to hold a given RPM, because ultimately that is how will cage changes. You don't want to over spin the prop, nor do you want to leave any power on the table. It's a little beyond difficult to pull that off without a tach.
How does it currently run in the water? If it is running OK but just won't run dry, you are likely down on power and/or lacking RPMs.
Here again, you come back to needing a tach to make and/or confirm that possibility/likely-hood.