I currently have a 283 in my 57. My son and I are thinking of rebuilding the 283 it's stock. came out of a 65 impala and I swapped all the parts off the original V-8 (265 I think) back when I was my sons age and dropped this one in. We have driven it a few times. Engine runs strong but compression is anywhere from 120-145 on the cylinders. It smokes but it is mostly a carb problem. Anyway, is it worth rebuilding the 283, or switching to a 327 or 350? I know the 283 is a solid engine and served Chevy well for years, but I am wanting to add power steering, and ac (eventually). Not having the bolt holes on the head make that task a bit more difficult. I know it is all doable but we are trying to keep to our budget.