i work at a dealer so i got mine at work. it was a pain because ford kept sending the wrong heads.(make sure they have a PI on them)the heads only cost the dealer $320ea. last week.(fully asssembled). so you should be able to find them under $400ea. in 5.0 or mm@ff they advertise a dealer in there that sells them at a good price. also check out the corral.net, there is some guys over there that have also done this, they may know a place to buy. i believe the only diff. between 99-01 is 01 you can use your valve covers,99's you couldn't. i took a friday off work and finished sunday morning. i would suggest you either port them your self, or have them ported, it's alot of work, so you might as well get the most out of it. the svo stuff is better but the price was out of my range. the 99-01 heads also come with better cams,svo does not. lt1's shouldn't be a problem
ls1's would be a good race. i'll know for sure when I get to the track
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96 stang, 373's, 70mm t/b, gutted maf, bassani x-pipe w/cats, ultraflow catback, home depot ram air, k@n. ported 99 heads, 99 intake and cams.