Every Mopar I’ve tested here that was in that hp range(750+) were all more cubes and were built using aftermarket blocks.
Yeah, 800 hp with a stock block is just a time bomb. I think we might have made 50 dyno pulls or so at the 800 hp level with that engine before it cracked the main webs. I would not recommend starting with a stock block if the goal is 800 hp. 700 hp is fairly easy to achieve with TF270 heads and a healthy roller cam and a stock block will live for a season or two at 700 hp. That is where I'd stop if I was on a budget and couldn't afford an aftermarket block.
