MMMMM...no. Matt is right. Even most of the first '64 blocks couldn't handle it with out barrel shaping the cylinders and torsional flex on the block was murder. Heating under nos apps would make me shiver in fear of a cast iron shower. Is this a budget thing or wanna be different with a small cubed chebbie? Wanna be different? drop a 307/327 crank in it and take the gears down very deeply. It's gonna be a while before you can tune this thing to run respectibly. 12's are a big stretch to achieve. ("BIG")