he said SOHC. Not DOHC...
I'm assuming 5.4SOHC from F150, and E-line? 5.0&FF did installed one of them beast(5.4 from econoline) in gt, and IIRC, it made gab of torque down low RPM, but due to restrictive intake, it didn't make that much power on top. But with different intake and tuning, i think high200 to low 300 is easy I think