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l76 with ls1 ecu is not so straight forward
just been doin heaps of research
mind u its easier than buying s crate motor l76
if u buy a crate motor from holden for say 4500 to 5000
then u wanted to buy the missing bits from a holden spare parts
u will spend another 4g getting the rest of the parts
trust me ive been thru it all for my customers

sourcing parts elsewhere might be cheaperl76 with ls1 ecu is cheap if u have
a spare ls1 starter o2 sensors

i have 2nd hand ls1 wiring looms and ecus and can easily be modded to suit the l76

but its around 500 to get reluctor ring on crank changed

then your forgetting the throttle body

l76 is fly by wire ls1 can be either

l76 is 90 mm ls1 is 75mm

so it means u have to run a cable ls1 ecu setup
and u have to buy a 90mm cable throttle body for best performance

untill people out there do the conversion they do not know completely what is involved

so it depends what parts u start with

if u have nothing i would go for the complete l76 engine and wiring etc
much newer etc

i think the reason they cannot tune the ecu as much is maybe the software is still only new
not sure i might be wrong

anyway i think if u buy a whole set from the same car u will have less hassles

i have guys buying crate motors from usa then buying ecus from holden in australia and they are not compatable

there are afew minor differences and there are afew more problems
you can run into

so buying complete set can save you afew hairs on your head