Welcome to the Chief club. And an outboard model too. They are less seen than the I/O's, and can be a bit easier to restore and re-power. Based on splash well shape, yours is very late 60's or early 70's. You can tell the year by the original hull color since they were a different color every year. If you peruse the brochures in the Starcraft section of IBoats, the specs give each years color. Yours may have had a mustard or yellow color? My '67 was burgundy, and had the same vinyl cabin sides. The rated HP for my '67 Starchief OB is 120, and the hull weight is listed as 860, but that went up to 140 in later Chieftain models as they became a bit heavier, though I am not sure why, since they are pretty much the same boats.
While you have had the dirty job of deconstruction done already, you end up in the same boat as Chem did and will have to guess and do detective work about where things go and you may have missing components that could have been templates. I had to do the tear out, but found the old stuff useful as templates and I made note of where things went for the put back. Take a lot of pictures anyway. Still, all you need to know is here in the work others have done, and anything you find will have a solution documented. You should really look forward to this if you are at all handy, and you will be rewarded by a very fine boat in the end.
Finally, Chem gave me some good advice recently, so I'll repeat it here: "...don't pressure yourself or give yourself arbitrary deadlines. Take breaks, keep up on the house chores, and try to enjoy the process."
Ron