You are focusing on the rigging as that seems to be the most noticeable disappointment.
That is understandable. It is also understandable that the blocks are missing as they are very expensive costing from $50 to $250 dollars each and they are easily removed and easily sold. I had the same thing happen to a boat I owned.
Before you go crazy spending a lot of money on rigging you might want to make sure the rest of the boat is suitable for what you need.
Right now the rigging seems complicated and the top priority but it may in fact not be the most important issue right now.
The first priority now that you own the boat is to find out how much it will cost to get it to the condition where it will be safe to use it for what you plan.
If those numbers don't work out you can always change your plans. It is a lot better to change the plans before you spend thousands on rigging parts.
I would start here.
Boat Inspection Trip Tips
The structural integrity of the hull, thru-hulls, bulkhead attachment, hull-deck joint, engine, prop, stuffing box, shaft, engine mounts, steering, rudder etc are all more important at this time.
Once you leave the dock you want to make sure the boat will help keep you safe.
The most important part of that is to keep the water out.
Before you worry about sailing a boat of that size you have to make sure you have a seaworthy power boat first.
Did you buy this boat all by yourself or do you have some friends that have gone in with you?
What are their skills?
Are your or any of yours friends a diesel engine mechanic, carpenter, plumber electrician, good with electronics. You will need all those skills and more to make this happen plus all the tools that go along with those trades.
You said you wanted to sail north. What are your plans?