470 is what I have been leaning towards, for those exact reasons. The pistons in those 500" kits are like an inch tall. I can't imagine that has any benefit aside from bob weight. there's almost nothing to prevent piston slap, it's a weaker piston, there's higher side-loading.

Since my application is a street engine, w/ pump gas, I want to build for longevity. In a race application, the issues I mentioned can be probably be planned for. Hard to give up 30 cubes though.