i see you getting 30/40 more with some trick head work,maybe get another opinion on your new head work/cam combo..
reason i say this is that Scott Duggins of PAR Racing Engines down here in S.C. is getting a little over 1,000 hp on his 565ci with the new oval port heads.
but make no mistake your 582ci is making some power on its own now,.
its killing my little raggy 511...lol
Brian