I have a 408 stroker built by Mckeown Motorsport in Maryland that dyno's out a peak HP of 682 and TQ of 572. It's still on the ragged edge of what I consider streetable.
He has an all aluminum 351C block that he calls the "Titus". A few years back he stroked one to 444 cubic inches and entered it in the Engine Masters competition. It made a peak HP of 932 if I remember correctly.
I love the horsepower but you must use it judiciously or you'll blow the very expensive ZF! Good luck with your search.
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