I have some good news! I was able to start the Safari the other night. I took off the exhaust and she started up without much of a fuss. I didnt run the engine long though since it was very late and I was in my small shed. I tapped the exhaust a few times with a spanner and blew compressed air through it and saw some material come out. Put it back on and she started up again.
But I think there is still an issue. When I went to try and start it today, it wouldnt crank over. I took the exhaust back off and it semi runs. Any ideas on how to better clean the exhaust? Without the exhaust, initially it would run and die on its own after about 20 or 30 seconds. I fiddled about with the choke and finally got it to run for longer but it seemed to be on high revs. The idle screw is screwed in all the way. When I try and back it out a little, I can hear the revs drop and the engine dies in a few short seconds. As I understand it, having the screw in all the way sets the engine to run on higher revs. Any ideas on why the engine cuts out when trying to back out this screw even a little?
Also, I'm not sure if this makes a difference or not, but I have the throttle cable screwed down all the way onto the top of the carb.