ok this is only a ball park fiquire so lets go
engine complete < everything including the computer $2000 off TM
brackets bits and bobs fuel lines etc $1500
lvvta cert $800
auto sparky $2000 hook up computer, alternater, starter, temp and oil gauges posible electric fans etc
labour - do most of it your self micnic to finish things off $1500
- micnic doing it all $4000
exhaust $1000
MINUS if the 1KZ is in good condition then maybe you could get $3500 for it
summry
maybe if you did alot yourself than $5000
if you got pros in to do it all maybe $10,000
only rough fiquires but this should give you an idea
time frames time off work and doing it yourself 2 to 3 weeks
doing it yourself after hours etc 2+ months
micnic working on it full time 2 weeks
micnic part time 6 weeks
there you go pull it apart and disect it all im sure theres holes in it
but you will get what i mean ah
good luck and the exhaust sound will out weight any cost differance there is in fuel
so say me whos running a 350 as a D/D on love gas mind
cheers