I drive my 77 280z turbo daily. I run 16-17 psi, a large frame T4 turbo, good engine management (TEC II), 550 injectors, good intercooler, upgraded clutch/fuel pump and cam, otherwise stock longblock and make 300+ rwhp all day long with no reliability issues. As Clifton said, you can make very reliable horsepower on pump gas, as long as you keep detonation at bay.