Update: I got her cleaned up better and can read the stamps better, looks like 1981 model, not sure how I got 1963 out of 81 anyway she's got decades of oil and grime on her. Getting that off takes time. I removed the 6" riser block and she's a bit more manageable now. Still working my way through her, found the R8 alignment pin broke off so I'm trying to figure out how to get that apart. She also has a bit of tick on the top side and cannot tell what's causing it. Going to start pulling the upper head apart this evening. If anyone knows why it's ticking that would be great. I'm working my way along slowly.