I went through an engine rebuild this summer and it sucked, I have all the tools and the know how but waiting for the parts like a complete gasket set as well as forged pistons Etc. was no less money than buying an SBT engine which is what I wish I would have done but I didn't know about them until it was too late. You have to consider there could be oil pump damage and clearance issues as well as crank bearings are probably going to be out of spec, my engine had 71 hrs when it cracked a piston and it needed exhaust valves , seats , I replaced the timing chain , guides , it needed crank bearings Etc. Etc. Etc. as well as forged pistons which by the way SBT engines come with(Premium engines). I could have ordered new plug tubes but I siliconed mine, they come with a new engine. I also lost 5 weeks of good summer weather waiting and rebuilding. If you do order one get it with the full installation gasket set. I can't see how the parts and labour could less than 3,000$ for a proper rebuild, once you tear it down and use the manual to check clearances you are bound to find more issues and the cost will rise. You also have to buy a few OEM tools to put the engine back together like a crank and cam locking tool, you should also have or rent a engine alignment tool.
) and I used to run a shop in my early days. I don't have the specialized tools but can take the boat to a tech for the final details. 
