6.3 L of displacement on a BB/BS actually. I'm already considering it on a Ford GT block in a year or two.
I'd rather do it on a prepped 351 windsor block, then BB/BS to 427 but with DOHC (somewhat similar to what Ford did with the 427 SOHC over 40 years ago). But that's -major- coin for even a decent setup like that...wonder if you can do that on a LT5 :confused
Back to the GT; as far as horsepower with bore, stroke, heads, valves, cams, compression ratio changes...dunno.