Should I refit 2a wings back to original or keep s3?

That's an intersting engine conversion. Those Merc engines are absolutley bullet proof, 400,000 miles is nothing and you can get the parts. They are smooth and quiet and I think it would be one of my to engine choices, the only problem is they are poor on low end torque. I suspect the power is about the same as a 2 1/4, the 4 cyl was only about 50hp.
I second all those who have said get it working right first, then drive it and then decide what to do cosmetically. I would keep a look out for a S2A lights in grill front end, it will add a lot of value and they are getting rare.