Re: 86 8hp Johnson carburetor body & needle part source
Well, the carb body is not available from BRP. Finding a new one may be a real challenge.
You could try outboard salvage places, like
www.tcoutboard.com. The 8 hp is rather a rare bird out there, frankly. Lots of 6 hp outboards from that year, but not too many of the 8s. You'll have to call the places, since most don't list parts on their websites.
You can also look for a complete carb on ebay. Could take a while, but one will probably turn up eventually.
Temporarily, you could also use a carb from the 6 hp model, which would essentially turn your 8 hp into a 6 hp. The same carb fits several years around that one. You can check which years on the site Tashasdaddy listed.