Will be complicated since those model numbers don't go with that engine. Somebody took a starter/blower housing off of a vertical engine and put it on the horizontal.
Looks to me like a 5 Hp ............... The air shroud is from a 1979 engine made in Dec.... It could be a 69 but I doubt it...... It's not a 89 for certain because those didn't have the kill tab on the head.....
All you can do is go by pictures.... It looks like a 77 though... The Tecumseh dating system is not clear like the Briggs...
Sorry I made a mistake and typed a 9 instead of a 7..... Thar date code is 1977 or 1967 which I don't think it is a 67 and made in December.... Look at different IPL's and see if the oil filler and other things are a match......
thumbnail_IMG_20181223_083621926 by David Shupe, on Flickr
Looks like it has gone booom before, repair in block, cylinder is scored. Any was to tell what block it is? Can I find another?