No more RHS Indy X heads

The thing that worries me ... a better head ... more hp/tq capabilities .... is this going to force a block upgrade ?
If we can get near 600 HP and 500 + torque ... at this time with eddies and RHS heads ... how much more can a stock block take ?
Is it even worth upgrading to this new head for a street motor ?
SO you lowered the price of the head ... but now raised the price of the bottom end ?

http://www.forabodiesonly.com/mopar/showthread.php?t=165579