auto B20??? :happysad: at least you'll beat other auto LS's
skip the boltons and LS head, get a GSR tranny swap.

I/H/E = $600
LS head stock = $100
head port and polish = minimum $100
cam gears = $60
plus labor for install if you dont install yourself

or

GSR tranny = $600
LS manual ECU = $100
plus labor for install

tranny swap is WAYYYYYYYYYY more worth the money and performance than boltons and a semi built head on an automatic teg. plus you can swap in the tranny while doing the engine swap to save more time in the future.