I sold a 428 Ford FE block to Donny Keene after he won the NHRA stock world championship, I've known him and his father a long time. A friend of mine had two of them and wasn't going to use both of them so I told Donny about them and he ask me to see if I could get one for him, I have a Dakota 1000 sonic tester and I asked him if he wanted to pay me to sonic test both of them to get the best one and he said yes. I ask what was the least he wanted in cylinder wall thickness and he said anything above .090 unbored was good
He did say he always sleeves all eight cylinder with ductile iron sleeves before building any of his race motors for his NHRA Stocker
I know several other southern CA NHRA 340 Stocker racers that do the same thing
The key to success is having that kind of work done is by having a good Hi Po machine shop do all of it
good luck, let us know what you do and the results