I recall the X wedge being the only S & S engine that didn't fit in a Harley frame. To this end S & S offered their own frame to match. Not sure how this affects above advice if at all Andy.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone