your leaving out soo much its way to hard to tell you anything.. Look at other people's combo, those will give you ideas.. Ideal 331 and 347 range from 310-345, rear wheel hp..
Look at the new 5.0 Mustang mag, when they stroked that stock 4.6 out to 5.0 Liters they lost alot of power on the top-end, but gained power on the lower end. I thought that was really interesting. YOu wouldn't think you'd loose power adding a longer stroke to the engine.