Yes you are.

I tell customers that std port heads are fine for stock blocks, good MW heads like CNC ported Indy heads or TF 270 heads should be paired with an aftermarket block. Customers hate to hear that advice since aftermarket blocks suck for Mopar guys. But anything over 700 or 750 hp starts to rattle the main caps and starts the process of cracking the main webs. It is just a matter of time before the block cracks. Might last a season, might last 3 or 4 before it lets go.