hmmm we are getting in to teritory where i would opt for an aluminum big block with Big Chief heads instead...
http://www.ultrastreet.net/632_1000_bd.asp with the price of a new, 8000 rpm kinsler injected large SBC you are almost into the same money....
personally id opt for the 582 with the aluminum block option
http://www.ultrastreet.net/582_classic.asp that is 14500 bucksand it churns out 745 Hp on 92octane ánd comes with a 2 year warranty