the way I did it
was to "tie-wrap" the chain to the cam sprocket. I would tie wrap then roll it approximately 160 degrees. Install new tie wraps in around the 9 o'clock position, remove the tie wrap in the 3 o'clock position and roll it again. The chain was ALWAYS engaged in the cam sprocket. Took about 6 of these cycles before the new chain was all the way in.
I have a photo if anyone is interested. I did not even have to have any help.