Every dyno test I have seen on the 360 / 380 HP Magnum crate motors from Mopar Performance has them making at least 410 HP with a little tuning (even the 300 HP versions are making 320+ when dyno'd). These motors came with stock magnum heads with the stock 1.92 Intake valves and 1.625 exhaust valves.
So I would agree you don't need high dollar heads to make 400+ HP with a 360.
