unless the chassis is b-swap ready you'll spend more just getting the motor in. i'd get another z6 (best d-series head imo) and take it to a machine shop to get rebuilt. for about the same cost or less you'll have a brand new motor as opposed to a used LS and you never know how it was ran. and for about another +$1000 you can put some badass internals in it to handle higher boost.