500 vs 512 from 400ci

Hi

I am planning to build a new short block for my car. Idea is to use 400 heavy 230 casting block as I can't really afford buying aftermarket and I wanto to be able to use all my current top end and headers...
To make it live longer I was thnking about Milodon cross bolted mains or BCR gridle with aluminium main caps. I like the Milodon option better because it looks cleaner and I'm not really sure if I should install aluminium main caps on street driven car. It's not a gentle driven cruiser, but is sees a lot of street miles and a lot of hard miles.

Dillema between 500 and 512 is mostly based on compression height of the pistons used in these strokers. Usually 500 uilizes 6.760" rod but piston comp height is just 1.1" where 512 uses 6.535" rod with 1.3" comp height. I guess taller, more stable piston will live longer? I was thinking weather it would be good to build 500 using 6.535" rod and even custom made taller piston? Will this get me longer life out of that short block?
Last factor would be crank stroke: 4.15" for 500 vs 4.25 for 512... Is this enough of a difference to take into account as side wear factor?

Not long ago I was building a 512 with eagle light crank and it turned out very impressive. This thing revs up great, overall it made an impression and I started looking into this direction also after that.
Opinions based on experience would be great.
Any downside of these lightened 4.250 eagle cranks?

This engine with port injected nitrous will be in 1100hp range when I'm done.

Its a long therm plan, I'd probably start building after this season so there is plenty of time to work out a good combo and approach with block.

Thanks!