$800 for just the top end with no heads?
That's nuts.
I got a GenV and LIM I'll sell you for $400. All you'll need is a TB adapter from ZZP.
Find some L67 heads, they're cheap all over the place...and get some SD Headers...they're $200~. That way then you'll need a tune and other gaskets/odds ends...and you'll have that same cost for a crappy GenIII for a setup that'll make another 40~+ HP.