If you are going to offer these engines to sell, you need to take them to a machine shop, have them cleaned, documented and painted. Especially if you know a machine shop that is competent on 60 year old machines. Buyers of complete engines demand that these days.
The way I fix them lasts a long time. I refreshed a lot of engines in the 60's and don't remember having a failure. But if these are blocks that have sat around for a while and you want to sell them, going the route you went 10 years ago is the only way to go.
