Bretto beat me to it, But an adapter plate of some sort would be the easy solution. If the engine ran well that is the route I would go for now. You will not be able to use the dual fuel/vacuum pump, but if you don't need your wipers a lot it won't be an issue. If you lieve where wipers are used constantly then maybe it would be worth all the effort to make it right for a 3A. You'd need a 3A front plate, and a full timing cover gasket set, and you'd be pulling the camshaft or at least the gear to change the plate.