Theres a Merc parts dealer near Edmonton trail and 32 ave N.E. Its back by the old Mustangs. My last Impeller was $40, selenoid shouldn't be much more then that. You might be able to use an older Ford selenoid, I've seen one on a 70' merc 50hp. It had 2 holes drilled into the mounting bracket of the selenoid, aside from that you wouldn't know it wasn't original.
If you have the time, you can take your started to one of the hundred Starter-Alternator rebuilders on the other side of Edmonton Tr & 32, and they'll set you up for cheap.
If you have the time, but want new parts, look at Vancouver marien dealers. Even with shipping they usually far cheaper then here. Takes only a day or two. mercurymarina.com is one of them.
As for a manual, you'll have to buy one new. Check out Iboats.com, they'll have links for you to find a manual and even parts.
If you PM me the S/N (on the non-pivoting part of the motor, at the front), I can help you find the details for you.
Heres a manual for $30
http://www.iboats.com/Mercury_Repair...view_id.257736
Model Guide
60 2096171 - 2284856 1967
60 2284857 - 1968
60 6428681 - 6609650 1984 3 cyl
60 6609651 - A197391 1985 3 cyl
60 9415971 - 9444080 1985
60 A197392 - B110788 1986 3 cyl
60 9444081 - 9469329 1986
60 B110789 - B239241 1987 3 cyl
60 9469330 - 9506190 1987
60 B239242 - B396035 1988 3 cyl
60 9506191 - 9549298 1988 3 cyl
60 B396036 - C221499 1989 3 cyl
60 9549299 - 9585999 1989 3 cyl