Why would he object to an aluminum block, let me guess holing on to some out dated thinking that you will give up HP because of the aluminum block? Just curious. Letting a lack or iron blocks stop you from building an engine is outdated thinking. If it is a cost thing I can understand that, but frankly if you want to build a Mopar engine it is the only opting right now. So I fail to see the issue...

You can call Indy(preferably a dealer)and have an aluminum block at your door next week.