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IT's hard to say without knowing the excact combo. It could be anywhere from 300-400 depending on all the vaibles, but as you said mild my guess is more around the 300 area.
Ifhe has a good set ofheads afr/trick flow/edla i would say around the 320-340 if he has the avg. supporting mods.IF the heads are worked and LTs and a good intake it mite be 350-380+.U cant really tell what the number are with a 331-347if u dont really know the mods.Like the other guy said it could be between 300-400rwhp.
if you are going through all the trouble of building a stroker engine, put on some decent heads and a cam, you can easily see 340-350 RWHP with a good combo and a tune