A forged 360 Mag piston that comes in around 8- 8.5:1?

While a Big Blower is not in the cards the manifold I just got from MaX Wedge looks like it will accommodate a slightly larger unit like a 174. Another company in Australia makes a plate to install a 177 on a manifold designed for the 142/144. But honestly I truly will be happy with 400 HP. A non temperamental easy reliable 5700-6000RPM max type 400hp.