How much HP strokers?

lets assume its fox body 87-93

Displacement HP TRQ
302 225 300
306 Bored Out ? ?
331 Stroker ? ?
347 Stroker ? ?

My Question is how much HP and Trq they would make assuming everything that can be left stock is left stock. (IE: Stock air induction, etc.
 
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.