What do you think of proposed 505/512 build?

update> Well my mate had a huge result over the weekend@SPR at our Mopar Nats. I gave him a gentle push to go and talk to a guy who runs a speed shop over here, Mopar Man and a racer as well, just happened to have for sale a complete mild 589ci 10:1 wedge motor, pro-built, with 572-13's, street roller cam, jesel rockers, MP Block etc etc, hands were shaken at a price where you could perhaps buy the block/heads for.:)