Why not a 413 ?

Well yes, but I’m saying that if someone had one laying around and wanted to rebuild it and use it, using cast pistons for a mild build, it can be done for not much more is all.

Absolutely, 150% agree. They are good engines. They can be great for mild builds. Think of them as an under bored 440. ........and as far as power goes "really not much" under bored, either. Also, as long as you use a good quality cast piston, they will withstand small amounts of nitrous or small amounts of boost as long as you don't get crazy trying to lean it to the nth degree.