Update: just bought one of the 4.500 bore Callies blocks when it was on sale, so it's time to build a mild 540, 557 or 572. I wanted to do a BMP aluminum block but for my use case I think cast iron made more sense. Any of them will get me to reliable 10.0's, so I just have to pick a stroke and get appropriate pistons, cam and related components. I want to use my TF270's, internal oiling, and keep it as maintenance free as possible as long as I keep the nitrous tune safe.

Edit: also worth mentioning, I got into Sick Summer again for 2024. I really need to get cracking on a rollbar!