Sorry Buccaneer, I missed that photo with the connector – looks like someone put a Mercury fitting on yours. I’d just go with it until you get it running well – the Merc connectors are available everywhere. After that you can decide what you want to do.
The original looks like as follows:
And the connector:
I did a couple of videos on my J-2, if it helps here are the links: (for some reason I can’t get the videos to embed using Chrome)
Oliver J-2 on the water:
https://www.youtube.com/watch?v=gVJoLAn1Xfg
Oliver J-2 additional discussion:
https://www.youtube.com/watch?v=Q768-B9SGpY