I think I'm going to drop down a class and cheat. How about a 426 in a production block with a solid roller and a set of W2 heads? The class rules are factory heads and a hydraulic flat tappet. But if I'm gonna run against big blocks I don't stand a chance running those. Most everyone is cheating so I don't feel bad about it. I don't think anyone will notice the w2 heads because no one runs a small block mopar. Trick is gonna be getting it to pull 14" vacuum at 1000 rpm