Well let's talk about that. 15psi will get me close to goal. What can a factory steel crank handle? What rods and pistons? Is the block ok for that? I have a 1968 383hp. Should be 10:1, 906 heads, a Lunati cam of unknown size at the moment, Edelbrock RPM, and 780 holley. This was a spare motor to get the car moving. Can turbo it, E85 and go. A friend has a simular set up and is running 18psi but for very short time. We need minutes worth.