I've got the 230 c.i. in my '63. The engine is only supposed to have about 5,000 miles. It looks stock, and completely original to me, but that's what I was told and I don't know much about it beyond that.
It'll cruise at 70 all day without a hint of drama. I haven't tried to push it any harder, but it works less than several old V8's I've driven. FWIW.
